My advice is hear the nice persons’ reason why they are angry with you for your careless mistakes and the pain you have caused them in the past. If it is true that you did, then apologize to that person, and that you have learned your lesson. I know that you are a good person but you did careless mistakes but good or bad reasons going for revenge isn’t the answer, even if you think it’s for a good reason. Take this advice and just listen to them.