Regret.

*Sigh*

Regret is a good thing and a bad thing.

It's a bad thing because it makes you feel like garbage.

But, it's good too, because it means that your conscience is working.

Congratulations! You have a conscience.

I guess what you have to do is learn from your mistakes and not to let them drag you down, but let them go and make a better decision next time.

Because it's pointless to dwell on your mistakes.

Oh! And don't let your pride let you feel sorry for yourself.

Because that decision you're regretting now was your choice.

Just do your best, and make the right decision.

I believe in you.