I messed up bad and feel guilty.
why do you feel guilty?
I made a string of bad decisions.
Even though you have made mistakes, it is not okay to blame yourself and make yourself feel guilty. Let go of the past and move on in your life.
It's eating me up inside, so I'll move on by hurting myself.
You should learn from your bad mistakes and make sure not to repeat them. You don't need to hurt yourself. If you have suicidal thoughts please talk to people close to you.