Nervous about my future

I'm super scared about my future.

I've been struggling so much with my gender identity, ever since I was 12, actually. Lately, I'm figuring that I may be a very feminine transman, as I enjoy makeup and things considered to be feminine, but I really want to be a man. But the more I think about my future, the more I fear for it. Mainly, I'm moving to a new house, my dads got a girlfriend who has four kids, and they may be moving in with us soon. While my stepmom isn't entirely homophobic/transphobic, my dad is 100% against LGBT. I'm just so scared on how I'll come out to him; will he accept me, or reject me? What will my stepmom and siblings think? I'm just so nervous and scared.