I think you really need to talk to someone and soon, i feel alot like you at times and i also have children and i have attempted suicide a few times and i have caused my family alot of hurt and pain, believe me you don't want to do that they still haven't forgiven me for my last attempt. When you are feeling depressed i know its hard to see another way out, but there is help out there please remember that, is there anyone you can call and talk to? I hope you can find the help you need, life can get better.
I would try and find a dr immediately if I were you. I suffer from depression, or depressive episodes, and felt very much the same way you're describing. Do you take anything for depression? I don't think it is normal to hate life & want to give up everything. In fact, I know from experience it isn't normal. God bless you & good luck to you. You may be able to find assistance in your phone book for mental health hotlines that may be able to get you started in your search for help.
Good luck!! :) Keep strong.