Am I/should I be ed, or am I just gender-confused?

It's like I'm constantly changing my mind of who I am. One day I want to be a girl, then there are days where I feel like I'd be better off as a boy. I usually act very feminine to cover it up, because if I'm not careful, I come across as butch. And (not meaning to get too personal) in all of my ual fantasies, I'm a man. This has been going on for about four years, now. And in some way, I'm reminded of it every day. I don't think I could ever tell anyone, especially not my family. I've already come out to them as a and as a Wiccan, I wouldn't know how to break this to them. They'd just think that I'm doing this to shock them or for attention. What should I do? Do you think I'll ever outgrow this?