I'm really struggling right now and don't know what to do

I've been a lurker for a while but it's my first time posting. I'm just in need of some support at the moment. I'm 19 years old and live with both my biological parents . My mother growing up has been emotionally and and sometimes physically abusive. My father is an enabler and also cheats on my mother.

I bought a second phone in secret (with my own money) about a month ago that I use for things like contacting my therapist, friends. My other phone line was bought years ago and is controlled by my parents (tracking, etc.). Stupidly, I was using it in my room when my mother walked in and saw I was using another phone. She yelled at me about how I was deceiving and stealing money from them by using their phone even though I have my own second one. That I'm acting like I'm a rich kid and a brat. This makes me mad especially when she's buying new clothes and such she never wears all the time. She's demanding to know the new number now. I don't know if I was in the wrong to do this. I'm being forced to go on an overseas trip with her for a month and won't have any support like friends or therapy and I'm really scared. Even aside from this stuff, I'm just feeling really lonely and overwhelmed right now and would appreciate any support. Please tell me if I'm being selfish or crazy and that it will get better.