Hey!
Being a woman who enjoys giving oral (not every single time, of course, but very often) I can just add my own few thoughts on the issue.
First of all, just like Sin Secret I would ask: Do you give oral to her? Do you like it? Does she enjoy it? Do you do it often? If you don't, then everything I would say on the issue applies to both of you equally. If she doesn't like receiving oral sex, do you indulge in other activities that she likes, even if you might not get off on them that much? Obviously, you can't want her to do oral for you if you are not ready to indulge her sexual wishes as well.
Second, I would also stress the communication point. Why doesn't she like it? Is it the smell or taste? (this can be somewhat fixed by hygiene and/or diet) Is it that she feels like gagging? In that case she might want to try out other techniques where she uses her hand to wrap it around the base of your dick - that way, the hand acts like an extension of her mouth while giving her more control and preventing your dick to slide in further than she likes it. In general, she should always be in control of the movement and you should never thrust on your own unless she tells you to. The mouth is a very sensitive area - physically and emotionally - and you don't want her to feel uncomfortable (especially if you wish for her to do this again). Whatever she doesn't like about it - lay it out on the table and talk about it! There are no right or wrong answers here. I always felt that giving a blowjob was in some ways even more intimate than having intercourse, and it can give rise to all sorts of feelings. All these feelings are okay. The main point here is trust and openness, and creating an environment in which she can safely talk about what this means to her.
The third point I would add is attitude. Our society has created many absurd images about sex, and one of them is this picture that a blow job is a service (a "job"!) that a woman gives to a man. I personally think that this picture - and all the images that go with it - has destroyed more than one woman's enjoyment of doing oral sex. Here comes a package of societal attitudes that can make you (as a woman) feel degraded or used or just plain resentful, because you have to "endure" this activity for your sexual partner, or it can make you feel like you have to perform a job, and that your performance is going to be measured against a standard set by porn actors (who actually do perform a job, btw!).
Okay, take a big step back from all that - it is all BS, and the more we let our sex lives be controlled by these societal pictures, the more we lose contact to our real fealings and desires and pleasures. If you want to enjoy oral (especially as a woman) - forget it all!
Our mouths are sexual organs, and smelling, tasting, sucking, licking, ... are great ways to enhance your own sexual pleasure. Any area on your partners body - the neck, the mouth, the ears, the nipples, the inside of the thighs, the feet, the dick, the vagina - all these areas have their own particular smell, taste and texture and they all produce different sensations for your partner when you touch them or stroke them or lick them or suck on them. This can all be part of a big exploration of your own and your partners body, and it is fun! Try out together what feels good, not so good, or extremely exciting..! Don't treat the dick as something inherently different from any other parts of your bodies - there is nothing that makes sucking or licking a nipple, a finger, a toe, a clit or a dick inherently different from each other - it's all play! And forget about "performance" for now (what is that anyway?). You do what you enjoy, as long as you enjoy it, and then you do something else. If your girlfriend licks your dick a little while and then goes on playing with a different part of your body - that's okay! Often times feeling that the other person is really turned on by what your doing is its own incentive to go on, but there is no pressure here. Eventually you will find things that work for both of you, and both of you will get more comfortable doing things that maybe you didn't even consider in the beginning.
If you can create such an open and playful and experimenting environment for both of you, I am sure you will both have fun and this "thing" that blow jobs have become in your minds (I wouldn't be surprised if this topic is giving her stress too) will ease and change and evolve. And forget your friends on that matter - sex gets better the more comfortable you both are with your own needs and your partners needs. This is not about a score we have to hit. And you don't know if all your friends are being entirely truthful anyway.
Maybe you can go about it more like a game, a fun together activity that's not about reaching a standard but instead about enhancing your sexual lives and the fun you have and trying out new things (or old things in a different way). If you like, you could look at books or internet sites together that explain different techniques of giving your partner pleasure - and I strongly recommend to start out with sites that explain different ways to make women happy! This will relax her and prevent her from feeling that you are putting pressure on her or that you are expecting her to do all these things from now on or that you are not happy with your sex life as it is. This is just about finding out about different ways, opening up options from which you can then pick and choose what suits you. And you might actually learn some amazing things that will make your girlfriend very happy! Once she sees that you are genuinly interested in her pleasure and in finding out what works for her, she might be interested in getting more specific about what works for you as well. Just go about it in a relaxed and playful atmosphere, and remember that everyone has the right not to do things that really turn them off, and that there are so many different ways to please each other that it really usually doesn't matter so much if your partner doesn't like a particular activity so long as you try many of all those other countless things that are out there and that can make you both happy. Also, these feelings can and do sometimes change over time, and technique does sometimes matter - in fact, with blowjobs, there are many techniques that are much easier to get comfortable with, especially if you are relatively inexperienced, than the "full on" or even deep throught thing we know from porn. Maybe you just want to lay off the blow jobs for a while, if she really doesn't feel comfortable with it, and experiment with manual stimulation. Maybe she just needs to get comfortable with the sight, the smell, the feel of your dick before she can start enjoying oral contact. As to manual stimulation, there are so many techniques out there that most guys haven't even heard of, many of which actually require a dedicated second person because you can't get this angle and access yourself, and that (according to my husband - lol) feel just awesome, especially if you use a lot of lube. This might come close to (or even top?) the blow job experience. And at some point, when she feels more relaxed about the situation, she might just find a way to incorporate oral play into your activities in a way that she enjoys more and that gives you the pleasure you are hoping for.
So, to make my long and winding answer short: Relax, try out different and new activities (that may or may not involve oral play - according to her honest to G'd comfort level at the time, do not rush it), and create the atmosphere in which trying all these new and exciting things is fun and a pleasurable experience for both of you. Best of luck!