Sunglasses: First, let me compliment you on your maturity in making a conscious decision about your sexual values. Too many people just believe the same thing the people around them believe and never think consciously about one of the most important choices they will ever make.
Scarbowl is right. People are going to hassle you about it. One thing you may want to consider is changing the people you hang around with. Girls who make decisions like yours often find strength in fellowship. You aren't the only person who's made this decision. You need to make sure you're hanging around with girls, and guys, who respect this decision. One think to remember is that people who take stands always get heckled. Antislavery activists, civil rights activists, and even people who were seeking the vote for women were heckled. "If they're shooting at you, you must be doing something right."
I think the best comeback for anything like this is "That's my business." "That's my business" is simple, assertive, non-offensive and has the added benefit of being true. If they repeat something, you respond with "That's my business." You repeat it as long as it takes. They'll get tired if they realize they can't fluster you. If you cuss them, you're buying into their game. By telling them "That's my business" you're asserting your right to not play their game. They aren't going to go brag to their friends, "She told me it's her business."
Best wishes. if you need any support, this is the place to come. We respect people's right to make decision about their bodies and we'll support you all the way.