Hey! It's perfectly natural to be confused about your sexual orientation. Pretty much every guy who grows up to be straight has once had a crush on a guy. Pretty much every lesbian has had a relationship with a man. Pretty much every teenager goes through a phase of being confused about their sexual orientation.
One important thing to remember is that you don't have to label yourself. It's okay to be curious!
For the moment, I think that the best thing for you to do is simply to accept that you're 'questioning' and have fun with it. Date girls. Date guys. One day, you'll come to a decision. Until then, you really don't need to worry too much.
I'm sorry that I can't give you a cut and dried 'you're straight' or 'your're gay' or 'you're bi' answer, but that's not how it works. You're the only one who can determine your sexual orientation, and it's not something you can do overnight. Rome wasn't built in a day.
Best of luck!
-Fern