First off... Welcome to PC!
I know things may be hard deiciding gay, straight, or bi? I can see girls being really pretty, and I thought that made me a lesbian, but I have such an attraction for guys. But don't stress it. Just be you, and you'll make up your mind and hopefully things won't be hard then. Don't be afraid of being gay. I know some people dislike that or homophobic but there are alot of people that don't mind it. Just stick up for yourself and be strong. It may be hard but things will ease up soon hopefully.
Good luck to you!