You are where you are.
You are who you are.
You’ve done (and not done) what you’ve done/not done.
Accept it.
Regret is the most pointless thing in the world because you can’t go back and change anything. Anything!
What have you learned?
How can you do better from now?
What do you want your life to be like that works for you?
Always know, there is the support out there that you need.