Freaking out over it won't help at all - natural enough reaction tho so please don't feel bad. Just take a bunch of deep breaths and remember that the world will not end if you don't figure this out right now. Or tomorrow. For some folks, the answer changes, maybe several times.

I will say that it is my personal opinion that our society's relative permissiveness (compared to a generation or two back) tends to reinforce gender confusion. I think that homosexual feelings are relatively more common than most of us would think (or admit). Fifty years ago, most folks would bury their head and those feelings. Now, everyone wants to tell you that it's OK, and while I'm certainly not advocating a return to our homophobic past, I do think that it makes it easy to react as you are - to think "Gee, if I feel this way, I must *be* this way." Sometimes an urge is just that, and nothing more. So take your time, and remember you've got support here.

EDIT: Hey, no more moderation. I guess this was post 5. Just thought I would add that I came here because I have a son who is dealing with similar thoughts, and just had a long talk with him about it last night. The above paragraph summarizes one of the things we discussed, and I admitted to him that I've occasionally had those feelings and urges, too. There's no simple, easy answer.