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 ?
I don't like either but the first person to throw a fist was fired.  In Western societies adults have the highest regrets and I'm feeling it now.
what do you think will happen to you
Maybe I'll get lucky and get suspended for 3 days. Regret is distinct from disappointment but I think I'm feeling both. 
i hope it turns out well for you. you appear to be a good decision maker. stick with your gut feelings.