The word "wallow" means to indulge or immerse oneself heavily in negative emotions or a particular situation, without making any effort to change or improve it. Full definition
Yesterday is gone forever and logic says there is no useful purpose in wallowing in past painful memories. (remonline.com)
They know mistakes are a part of life, so they don't wallow in self - pity. (inc.com)
Instead of wallowing in self - defeat, he poured his efforts into new enterprises, and constantly refined his visions until he earned his way back to the top of Apple. (inc.com)