Mothers depression is slowing me down

Hello, I’m coming to Reddit to get some advice. I’m 20m and live with just my mom, she has depression and probably some other undiagnosed things…I always feel the pressure to have to be there for her, she is constantly blowing up my phone throughout the day being sad, crying, guilt tripping. She’s not the nicest so I usually stay to myself because when we do spend time it doesn’t always go the best. I miss work to tend to her because she’s down. This Christmas I went to my friends house, but also took the time to make sure me and her spend time, We were supposed to watch a movie after I got back from my friends but because of me going she did not want to anymore, then complained I ruined Christmas when she could of spent time, it’s self sabotage to me. I lost my girlfriend because of my mom stalking and blowing up her phone. I try to set boundaries but they’re not respected, I get told “I’m your mother, you’re my kid” ect… I won’t make this too long but I would love to hear what I should do, thank you for taking the time to read.