Finding Strength While Healing and Handling Harsh Words

As-salamu alaykum. I've been fighting depression since I was 18 (I'm 30 now). I live with my mother because she lost her job a few years back, has no savings and made some poor financial choices. I cover the mortgage, bills, and so on. I want to move out, but I can't afford rent and the mortgage at the same time. The hard part is dealing with my mother's constant negative remarks. She's anxious and impulsive, and almost every choice I make that doesn't match her view gets a critical comment. I want to try a new hairdresser after not cutting my hair for two years - she says, "They'll ruin your hair, do you know someone who goes there? I don't like it." During exams in high school and university she would say, "You're smart but lazy, you'll fail. Why try so hard if you'll just get a low score?" Keep in mind I was working at the family business while getting my Law degree. Right now I'm in retail because of depression and some bad money decisions on her part during my last year, so I had to start working. I do have my degree though. Because I studied Law, coworkers sometimes ask me about contracts or workplace rights. I always tell them to see a professional for serious matters, but I can help with simple things and give practical advice - like, "Based on the contract and the law, you may have a claim; try talking to your boss saying A, B, and C, and if that doesn't work see a lawyer and ask for X." I've been right most of the time and I give advice that won't put people at risk. Usually it's about being polite, standing your ground, and negotiating. My mother's reply is often, "Be careful, you'll get fired and won't find a job!" Even when I try to exercise she says, "I don't know why you're working out - you lack discipline and never finish what you start!" I'm doing better now: my mood has improved, I'm more active, and I want to do things. I'm slowly recovering. I try to ignore her comments, but they pile up. I often feel like a failure and like I don't deserve to give advice. That insecurity is why I took this job instead of aiming for something better; I felt like a fraud. I'm even ashamed of my Law degree - it's folded away, never framed, I don't want to look at it. I know I was a good student and professors said I had potential, but here I am at 30 working retail and feeling like I wasted my 20s just surviving. I know I have life ahead, but the shame is heavy. How can I cope? How do I tune out my mother's words and my own negative thoughts? I feel ready to change and improve, but I can't hold on to motivation. I keep going by forcing myself and using reason, and sometimes I do feel joy and make progress, but I need something more to keep going. Any advice would be appreciated. Jazak Allah khair for reading and for any support.