I'm feeling enormously regretful about my life for no reason.
That must be frustrating. Did you have a hard time along the way?
What do you mean by hard time?
A hard time, like when you approach a fork in the road, choose a path, and later have regrets about your choice. Just about everybody has an experience like that. Best to learn from it and move on.
What's so great about learning and moving on?
When you learn from it, you're less likely to repeat something that may have led to it. You can't dwell on bad experiences though, unless you want to have a miserable life.