How did you know what you wanted to do with your life while fighting depression?

I'm a 20 year old female and I have been in college since I graduated high school in 2016. The thing is that due to quite a bad childhood I have extremely bad depression, PTSD, OCD, and anxiety, both generalized and social. The real problem is that although i have gone to college on and off I have no clue what I am doing in life. I went to school to be a vet and quit because of other health concerns, then found out I was fine. Went to school to be a vet tech and now here I am changing my major again with zero idea of what I want to do. I do not have any interests because of my depression. My mom asked me one day what I would be if there were no health concerns, time limit or money involved and my decision was easily a doctor. But here I am going to school in January to do more gen ed for a degree that I have no clue what it is. Now I know that you all cannot tell me what to be in life, but from someone elses perspective that also struggles from depression how did you know? I have zero hobbies. I don't even have friends to ask because of my social anxiety. I just am at a loss when it comes to this. I have no idea. HELP ME!!