You should be proud of yourself to be man enough to admit it. You are rebuilding yourself, and it all starts with a solid foundation, then you build it brick by brick. I'm sure there are days it sucks, but you have an opportunity in front of you. I believe its natural to have regrets. If you didn't feel some guilt and shame, that would be abnormal. Staying positive is often easier said than done, but it can be done. Tomorrow is a brand new day, and it can be a better one.