It's wrong to wallow in your own self pity.
Jan made a big mistake at work is having trouble getting over it.
Jan never wants to make the same mistake again.
Jan doesn't think about the mistake anymore and is confident that it won't happen again.
Jan constantly thinks about what she did and intentionally makes herself feel bad.
Jan never makes the same mistake again, and she is more productive at work.
Jan doesn't accomplish anything, and it just makes her feel worse.