At work I just overstepped my position, I'm really going to Regret it when I go back to work. I'm guessing there will be negative conscious.
what did you do to end up in that situation?
Fired someone with out telling my boss. Two coworkers got in a a fight I perceived opportunity the be the best time to get rid of one. 
how did you choose who to fire or you knew who you wanted to get rid of beforehand ?
Regret
Regret is a negative conscious and emotional reaction to an undesirable situation. 
Regret is related to perceived opportunity. Its intensity varies over time after the decision, in regard to action versus inaction, and in regard to self-control at a particular age. The self-recrimination which comes with regret is thought to spur corrective action and adaptation. 
In Western societies adults have the highest regrets regarding choices of their education. 
Definition.
Regret has been defined by psychologists in the late 1990s as a "
he slept with a girl or he didn't because she says he did and he says that he didn't. It leaves you guessing, and the movie still works with 20 minutes gone out of it.' I thought, 'Oh, my God, that's what we’ve got to do. We've got to have a missing reel!' I'm going to use it in a way where it actually says 'missing reel' for 10 seconds, and then when we come back, you're arriving