Becoming someone you're not is the worst possible thing you could do. Everyone should be true to themselves to a degree.
You just happen to be one of those people with good genes and a good personality, and some hobbies some guys can relate to. You sound quite ideal, actually. I do sympathize your predicament though. Unfortunately, there's two sides to everything. You can do one of two things, or both of these two things:
- Make sure things don't get wierd between you and the friends that confessed to you. They'll get over it at some point, eventually they have to. Something they'd most likely regret is spoiling your friendship by trying. Make it very clear you aren't interested, but also don't hold anything against them for it.
- I guess when you make friends with someone, you could tell them about your problem. Then they may sympathize with you and would make sure their interests don't go too far. I'm pretty sure that would work.