I met a girl on this site.

Just doo it! http://img1.ak.crunchyroll.com/i/spire4/05212008/5/7/9/6/57962ebd68fb30_full.jpg

http://www.deathandtaxesmag.com/wp-content/uploads/2014/05/pussy.png u already know

Do what you feel like before you have any regret in your life. Ask yourself, do you want to be with her and got any feeling for her. Either be a chicken or a Phoenix. You choose.

If you were over 18, I would suggest some stuff.. But you're 15. You have plenty of guys and girls around you whom you can choose from. Online dating will just be a hassle as you will never see them. Don't "listen to your heart", listen to logic and reason.

I say if they like you and you like them, go ahead and tell them. I don't see how it could really hurt, and if anything, they may be the "right one." You never know, right? If you can't just say it, you could maybe try waiting for them to say it again and just answer back with an "I like you, too." I would say you should try to tell them and not wait if you can. Good luck.