I sometimes wish I were gone...dead
Why would you want it all to end?
It's hard to live. I can't pass my classes and I've made all kinds of mistakes.
Even though you have made mistakes in your life, killing yourself is not good and will not solve your issues. Deal with your mistakes straight on and give up on death as an answer.
I don't care if I die.
You should try to find something that makes life worth living. I think that it is bad to want to comitt suicide.