Everything

I'm sorry for not being who you want me to be,
I'm sorry for being the disappointment
I'm sorry for letting you down
I'm sorry for being weak and pathetic
I'm sorry for not being perfect
I'm sorry for not being happy all the time
I'm sorry for all my regrets and mistakes
I'm sorry for your death
I'm sorry for letting you slip away from me
I'm sorry for being a disgrace
I'm sorry for cutting
I'm sorry for being suicidal
I'm sorry for being worthless

I could continue
But I'm sorry. For everything!