Should I feel this way?

I’m not depressed or idk. But when the world went silent things in my head goes noisy and making me think about things. My brain will always ask same questions "what did I do wrong "

If you focus on the trees, you’ll hit them.

Okay. What’s up with think about the past? I done many regretful stuff to end up where I am now. But can’t do nth about it. Now im just thinking of what I can do now and in the future that can make me a better person.