How do I gain perspective after causing a car accident?

It's been two weeks since the crash, and every day since then I spend nearly all my waking hours just beating myself up. All I can think about is how easily I could have avoided the accident if I didn't make such a stupid mistake.

As you can imagine, a lot of negatives arose from the accident, and they constantly torment me. My car got totalled. The meagre self esteem I had left is in shambles, my opinion of myself as a failure is cemented. I got several points on my license (although it was my first infringement) such that I only have 1 point left on my license. The only positive I can think of is that no one got hurt.

I'm in such a bad place mentally right now, prior to the accident I was already in difficult circumstances. I really feel like I've hit rock bottom, and idk what to do from here. Since it's been two weeks, I thought that maybe the pain would subside, but it's showing no signs of stopping. I know it seems dramatic, but it really feels like my life is over, like I won't get over this.

If anyone has anything positive to say, even if it's just making me feel like I'm not the only idiot who's caused a car accident as a teenager then I'd appreciate it.