I get through life by remembering two things (other than being caned):

1. Only worry about the things you can affect - if you didn't do something in the past then beating yourself up about it doesn't make any difference. Deciding how you can do it in the future doesn't
2. It doesn't matter what 99.9999999999999999999% of people think about you. It's only your nearest and dearest that matter and if they really care they will want to help you.