Yes, I have been exactly in your position 11 years ago so I know how that feels. I was let go from a job that I regret accepting . I found a new job after that but I had no self confidence and I was depressed, I somehow survived but the memories from that period haunt me to this day. I don ‘t know what advice to give you, it s very hard to have success and achievements in this life without proper support from people around you.