How can I determine if I should be a boy or girl?

I feel like I would be more comfortable as a girl even though I still like girls. I think I'm like a girl stuck in a guy body. I imagine myself as a girl too. I think this more because my friends say that if I was a girl I would be a hot looking one. And I don't care about having boobs or anything. I just feel like the way that I do act will make more sense if I was a girl.