I messed up... time wasted ; taken for granted
I understand where you're coming from but that doesn't mean its too late.
I sometimes think about doing that, but not really.
It's hard when we mess up, but it is completely normal. Try to remember that no one is perfect and just do your best in the future.
I'm going to kill myself the next time I mess up.
That seems extreme for making a mistake. It sounds like you could really use a professional to speak to. Making mistakes is a part of life and to do something so extreme isn't okay.