Am I asexual or confused?

I have been very confused lately. Sometimes I think I'm totally gay, then it changes and I'm like.. totally straight. I used to fantasize about me and this one guy kissing, and when I did I had this "good" feeling. Like, a breath of happiness or relief. And sometimes I was turned on. But now... I think I might be asexual. I've never had a desire to have sex or something. I've had crushes on guys but they were mainly emotional. For some reason I stare at other girls butts and boobs but I have never had an attracted feeling towards them because of it. If a girl ever asked me out, I would say no. I've never had a desire to date them either. I'm confused, what am I? I'm also 13 by the way..