If we really ask the question- 'Why do we punish ourself?', the answer might not be that simple.

To it's core it consists of poor self image- feeling like we can't do anything properly, hatred of one's own body, thinking we are less than others and many more.

It's imperative to have a good and healthy relationship with oneself, part of the healing process is grieving the loss of who you were before and getting to know who you are now.