Am I or am I not?

I’m 19 and I’ll be stuck with my extremely homophobic/transphobic parents for 2 more years so this limits the ways in which I can explore my gender expression. I think that I am trans and that when I get out of here I want to cut off my hair, get a mastectomy and maybe go on T. But I’m afraid of telling my friends because I don’t know if I’m 100% sure I’m trans. I realized that maybe I am a boy when I learned than being trans isn’t just “being born in the wrong body”. I got really excited when I went through others transitions. I don’t think this is a phase and I think that maybe I’m just scared of facing this reality.