i feel like shit
You feel like a total piece of garbage because you just found out you made someone cry, yell at you, or got stuck with the worst part of your dumb decisions.
I feel like shit because my sister cried when I told her I ate her last slice of pizza.
My friend just yelled at me because I spilled his coffee on his shirt.
I feel like I messed up big time when I told my mom I failed math.