We all have it and we wish a rewind button existed.
I know I do all the time.
I regret the most over choices I made when I could've taken the other option and mostly doing things out of deliberate defiance and impatience. Or there were regrets for things that I didn't do because I was so concerned about the wrong things.
At the same time though, if those choices weren't made and those actions weren't taken, would I still change the way my life is now.
It's hard to say. Academically, I think I could've made a better choice. Socially and emotionally, I think the past 2 years of events contribute to the way things are now...
When it comes down to whether or not a rewind button exists, I don't think I'd change a thing despite my random rants otherwise.
The ugly past makes us better people for the future when we decide to let go of it and learn from it.