Regrets?
They should guide your life. Be they small regrets like 'I should not have stayed up so late on a School night' or massive regrets that make you sick in your stomach when you think about them.
I'm a firm believer in learning from my mistakes and I have made some fucking huge ones. I wont dismiss them as par for the course, I will worry about them, and I will dissect them to ensure I don't repeat them.
By far the worst thing about mistakes is the effect they have on others. It’s the lack of thought towards other people that really sickens me about my mistakes. But wallowing in self-pity is not the answer. You make a mistake; you have to deal with it. Regret it, rebuild bridges, re-earn trust and learn from it.
And apologise as much as you can.
I'm sorry.