You are 13-15 and dated a lot of guys already? Perhaps you just need a break from dating, a chance to hang out with your female friends and go shopping and watch movies with them.
ok I didn't mean to imply anything bad about you. All the best.
You're bicurious, and it is totally natural. You don't need to feel any rush to act on it. Just go about life like you normally would and let yourself fall for people naturally. If it's a girl, then great; same thing if it's for a guy. Don't stress about it. ^_^
Uh...hormones or sisterly affection?
Please don't be offended. I meant as in whether you are sexually aroused or just liking girls as in you are more comfortable among girls?