How do you know if your gay or transgendered?

I guess I have kinda always been different. I'm a girl, but I was never as girly as any of my friends, and mainly had guy friends. Then puberty hit and I'm a ton more grossed out about things like periods and stuff than any of my girl friends. I'm like...ashamed of it. Idk. Iv always liked sports, and still play soccer and ice hockey (on a coed team) whereas all my girlfriends have dropped out by now. There's only one other girl on my soccer team, and none on my hockey team. Somedays I'm really girly and wear makeup and skirts, but most of the time I wear pants and stuff. I like boys, but recently have been liking girls too. Like I don't see the difference between them anymore. Somedays I'm convinced I was really supposed to be a boy, but other days I like being a girl. It's like I'm a totally different person each day. How can I figure out who I am, and how to I know if I really am transgendered or gay? Like I identify with both. Im just so confused and I just don't know how I can ever find an answer if I'm so inconsistent. In just don't know what to do