If I could pass on one piece of advice, wisdom from life experience, it would be this. See things as they are, not as you wished they were.

Relationships, business and even training in martial arts.

You can't turn back the clock so spending time living in regret really is a waste of your precious time and energy.

The best thing you can do for your own sanity is take ownership of it, learn the lessons, see things and people as they are and move on.

There is more and better opportunities waiting for you out there.