Hi. I don't have ground breaking advise for you, but I can relate to some of it. It sounds like you are still young and that count in you favor. There is still hope of living a life what you want to. It is about taking charge of it. Yes, you made mistakes. Yes, you got fired. Learn from it. Don't wake up one day and see : "S***, I'm 41 yrs old, unemployed and living with my mother." That is tragically true for me!! And most of it is because I messed up. Life is so short. I wish I can have mine over from the very beginning. I feel it is to late for me, but not you. You sound like a very smart, talented person. You WILL find something. Try to focus on the positives. Most of the time all situations have more positives than negatives. When depressed we just tend to focus more on the negatives.
Good luck!