I have few regrets, but one of my biggest is not graduating high school.
Aww having regrets is so negative and maybe you feel that way because of inaction of completing HS?
It's true. What I can I do to get over that feeling?
Since regret is from disappointment, maybe try getting your GED?
Good call - and I did that. I think what I regret most is missing out on the experiences, like prom.
I can see that - Prom is a major high school event. 
Is there anything you missed out on in school?
Yes I do have regrets about school by missing a perceived opportunity to be a part of school counsel and change some rules in school.