Am I bisexual or something else?

I've been struggling with my sexuality for a while now, I'm not sure if I'm hetero or bi, because I know for sure I like girls, but... Whenever I see pictures of guys naked and stuff it does turn me on (not just kind of, like a LOT) but it's he same with girls. I've fantasizes about girls a lot, but I've never fantasizes about guys, but I think I'd like to try being with a guy too... I dunno, I'm just really confused right now and I need help.