In a strange way, the fact that you were at fault is a positive point because it means that the future is under your control. Just don’t repeat the same mistake and your golden.
But seriously, the only advice I can give is to grab yoursef by the scruff of the neck, plunk yoursellf down in the drivers seat and get on with it (metaphorically speaking).
Just force yourself to do it.
Years ago someone plowed into the drivers side of my car at an intersection. He was in the wrong and if the impact had been a few inches closer to the drivers seat, I would have been seriously injured or not around to tell the tale.
Afterwards, I just knew that if I surrendered to my immediate fear and reluctance to get behind the wheel again and allowed it to become an entrenched habit, I might never drive again.
So, I just gritted my teeth and forced myself to get back in and drive because I valued my independence way too much. Not being able to drive again was unthinkable for me so I just had to tough it out.
The fact that this happened in Mass. In the middle of a snowy winter didn’t help at all. And I was one extremely paranoid driver for a long long time afterward. The fact that it was not my fault was of little comfort because knowing that I have no control over other stupid drivers kinda made it worse.
But I got through it and so can you. But you just have to tough it out and force yourself.
Altho perhaps you could also contact either AAA or a driving
School and take a short refresher course. That may help with your confidence level.