<human>: Summarize the given text in a few sentences.

I am a 17/f. I currently live with my mother, stepfather and 2 half siblings (1 and 5). I've lived with them for 5 years - my mom and I moved to PA from MA so she could be with him. Since she's had her other kids, things have been going downhill and I despise living with them. My stepdad and my mom constantly fight; several months ago they were ready to get divorced. It is very stressful and I'm sick of dealing with it. 

My mom is really bitchy and she hates my dad. My dad lives in MA with his girlfriend and her 2 kids (she has more but they either are off in college or on their own). It is a much more relaxed environment and my whole family lives here, and due to the distance I never get to see them. 

I'll be 18 next month and I want to move back to my dad's and get away from my mom and finish my last year of high school. The only problem is I don't know how to tell my mom that I am moving. I know she's going to be mad and tell me I can't, but since I'll be 18 she can't stop me. My dad is on board, along with everyone else here. I just don't know how to approach my mom and how to deal with the backlash I'll be getting from her.
<bot>: Want to move from mom's to dad's, need to know how to deal with mom's protests and how to talk to her about it.