Of all the things I regret, I've never regretted taking chances and things going wrong, but there are a few very major things that are unfixble that I've done and really really wished I hadn't.However regret is a useless emotion and is ultimately self destructive, so I now use any feelings of guilt or regret to make sure I live my life in the best way I possibly can, on a very big scale. Regret in large quantities makes you a much better person than you otherwise would have been, and I am always very cautious of acting hastily or without exploring all the possible outcomes of something now as a result.So act carefully, charitably and wisely and with no ill will to anyone and you won't feel much regret with luck, but unfortunatley I was late learning that, but I have learned it thoroughly.