What do I do?

Ive talked to my parents about being a T-man and they yell at me. Ive talked to them several times about it, never have I raised my voice so I dont know why their yelling. THey sya that as long as I live under their house I may not do a single thing. Cept I cut my hair.....now Im grounded "for life." I only have a year and a half so I guess its not a big thing to get worried about but I want them in my life after I start the change. They way theyve been acting suggests that they want nothing to do with me as long as I claim to be male. Not having my mother in my life has been hard to deal with and I dont want to even imagine not having my dad or stepmom around. But I have no idea how to get everyone to come to terms with this. Help?