Parents Being Extremely Difficult

So I just turned 18 days ago and my home life is pretty crappy

Long story short tension has been building between my parents and I and I already planned to move out tomorrow

But stuff happened and earlier I told them that I’m done and I’m moving in with Brandon and his family and my parents both said that I’m not allowed because they are the adults and the bosses of me and I have to stay

I took my stuff and left anyways but they think I’m coming back

But my mom has my social card and I receive money from ssi every month that they use to pay bills and now that I’m 18 with my own child coming I don’t know how to handle the situation without getting more stressed

It’s the next day and I talked to my mom and she told me that I need to come home because this is my home. She also told me that I need to stay so she can use my money to help pay bills. When I explained to her that I need to start thinking of my own life because I’m 26 W pregnant she told me no and that I’m making her depression worse. She then told me that she’s picking me up from my new home with my boyfriend and his family (who ate very supportive) she told me no and she won’t listen to me.

I’m at a loss of what to do and any advise you ladies have is appreciated.