Is it true my parents have total control over me until im 21 in north carolina ? Im 18 now and cant take it!?

Im 18 years old! I have ALOT of mental abuse in my home! I went away and got saved and changed my life but being home is poisen to me ...... My step mom is CRAZY jelous with my dad I cant ever talk to him without her being paranoid im talking about her! She constantly Lies to my dad and puts me down . I try to have a relationship with her and help her out but she always finds away to argue with me and control EVERYTHING i do! I babysit for her during the week and she constantly complains ! Im in a rut where I dont have much going for me because of going to the program but they convinced me to stay saying things will be better ! SHE LIED! she constantly says im not doing anything with my life when SHe knows i dont have the necesarry resources to do what I gotta do expecially if im babysitting all the time !! She tries to control everything I do and complains about Everything and everyone we had a big blowout the other night about clothing and she said IM SLIPPING i wanna leave :[