What do you think about me being embarrassed of who I was and all the time I wasted?
Are you still making those mistakes?
No, I'm no longer that person.
There's no reason to be ashamed of making mistakes as long as you acknowledge them and try to become a better person as a result of learning from them. I think you should be proud that you've realized that what you did in the past wasn't good for you, and are no longer doing it.
Eh, I think that is a little too much.
Everyone makes mistakes and takes actions that they are guilty or ashamed of. It's only important that you have recognized those mistakes, and that you are trying to do better now.