Sexuality confusion

Okay, as far as I know, I am bisexual. But I lean way more toward girls. Like when I go into a room I look at the girls first then the guys after or not at all. My problem is I think I may be a lesbian. But I am still attracted to guys. I can tell if a guy is cute or not and stuff like that but its not anywhere near as close to the attraction I have for girls. Just recently I got a boyfriend. I like him and he says he loves me and stuff and he wants to have sex with me. I told him no number 1: because I think im too young and I probably cant handle it..theres too many risks, etc. And number 2: sex with a guy just doesnt seem right to me. It doesnt disgust me or anything, I just really dont think its something I want to do. Like I think I would have to seriously be in love with the guy to be with him intimatley. It takes a lot for me to fall for a guy, you have to be a really special guy to me. And if I think about it, I really dont have feelings for other guys. There were maybe 2 guys in my school that I had feelings for. My friend who is also gay told me that I am still young and I have a lot of time to figure myself out so I shouldnt be that worried about this Im just really confused and I need advice on what your guys’ opinions on this are. So help? (: