Big Changes

so earlier this month my 4 cousins had to move in because their mom is doing drugs and she basically lost everything (their house, etc).. and ever since they've been here, it's been wild and crowded.. i have to share a room with my cousin (she's 16) and tbh it bothers me, because i can't even have my own space anymore. the only time i can have my own space is if i'm in the shower or using the bathroom.. my mental health is so bad, i literally relapsed and started cutting again like an hour ago. school just started today, which i'm just ready to get it over with. but like, i don't want to seem rude, i love my cousin.. but it sucks to not have my own room anymore. they'll be living with us for a while and it's just driving me insane, i would stay at my friends house for a couple of days but she's moving to her dads house temporarily so idk when i'll see her again. we're cleaning today and my mom made us put her clothes in my room, and she wants me to put some of her clothes in my dresser when i already told her that not even all of my clothes can fit in there. i've thought about running away tbh, another thing, i would stay with my sister but she's at my house everyday.. i talked to my therapist about it, what do u guys think?? what should i do?