Is it normal that i think i'm gay?

I think I might be gay. I'm a girl. I love a guy a lot, but his girlfriend looks a lot like him; because of this, I think I might start liking girls. I don't want this to happen. I wasn't interested in one ever in my life, and don't want to start now. His girlfriend gets in a lot of arguments/fights with people IRL. I sit next to her in 1 period. It's annoying, and it hurts to know the guy you liked for 4 years has a girlfriend you sit by at school for one period. I don't know how long they've known each other, but they probably get a long very well, I guess... his girlfriend over the time for this 1 month or so has been starting to look like him. :\ I notice that couples that love each other start to look like one another. P.S. I meant lesbian* in the first sentence, sorry. How do I stop? Any tips? I know there's nothing wrong with being gay or lesbian, but the problem is it's my life that's being dealt with something that I don't want to chose or feel. No, I'm not scared of anyone calling me anything, it's just that I don't want to deal with this. I find girls whole of crap annoying, so I don't want to be this way. It's weird, and it's different. I'm very nice to everybody I see, that's probably the problem. It's very weird that now I actually see NO difference between the genders. I'm like, "what the hell, it doesn't really matter, no one's going to like me anyway, or even care, so fuck it, that guy's girlfriend is never going to even love me so fuck everything I'll just hit on everyone." LOL basically I don't care about life anymore. I just want to end it, love dies. Fuck >:{ I don't want to give up though. Being gay or lesbian is an option for me. I will stop. I just needed to get this out, thanks.