I am 17 right now and I am really confused about my sexuality. When I was younger I made out with a girl a few times on the same day and loved it. I couldn't wait to do it again. Then I got older and I started having interests in guys but never forgetting that kiss.
Now that I am 17, those feelings are coming up again and I have strong feelings for one of my close girlfriends. I have even had dreams of sleeping with her! I am so confused!
I had always thought I was straight.

You are obsessed with the girl... and you "I had always thought I was straight.". Maybe you need to do is a personal approach. The best step is you must choose a community where you can reduce the sense of love with girl. Change the community's new friend, if it's difficult to do reduce the frequency of interaction with them. And start looking for friends who love boy.
If you still have trouble telling the people closest to you are your most loved and trusted.

Why do you need a label? People rarely fit comfortably in the little boxes labels push them into.

Female sexuality is fluid. You may find yourself changing the label you wear several times throughout your life. The important part is to be comfortable with who you are, not to find a label that fits.

When I was just a little older than you, I was suddenly hit with the realization that I had a crush on my college roommate. I'd had crushes on girls before, but was always able to bury the feelings and convince myself they were something else. That was impossible when I lived with the object of my affection.

Instead of worrying about labeling yourself, you should be deciding if the risk is worth the gain. Are you willing to admit your feelings to her? Are you willing to come out of the closet? Are you willing to risk the possible ridicule to have the sense of freedom that comes with being honest about who you are?

this (http://www.youth-guard.org/) mailing helped me a lot. You'll be able to talk to people around your age who are going through the same thing. They won't judge you or tell you that what you're feelings is wrong or bad. Just listening, and being able to talk freely, may help more than you'd guess.

Being bi curuios would effect you in a more negative way.

Bi sexual is a complicated process. Bi curious is where you just want to kiss the girl. Ever heard the song "I kissed a Girl" by Katy Perry? That song is a perfect example of bi curious. She wouldn't have dreams of the girl if she was just curious. Ya know?