I'm sorry.
I'm sorry I wasn't a genuine friend.
I'm sorry for always being a problem.
I'm sorry for not meeting yout expectations.
I'm sorry for never learning.
I'm sorry for causing you pain.
I'm sorry for making you feel less than you are.
I'm sorry for being selfish.
I'm sorry for coming into your life in the first place.
I'm sorry for existing.

I was supposed to be your everything.
I'm sorry I couldn't be.