You won't kill yourself. Nobody needs to kill themselves. If you feel pain then that is part of life and a thing that everyone will have to deal with. Maybe not on the same level but no matter what, there will always be pain. You can't stop that. What you can do, however, is be strong and don't let it get to you. I know that some people have different ways with dealing with pain but there are other options besides self harm. And if you think you aren't important then you are wrong. Everyone has a purpose and you need to find out what it is. I have never met a person who wasn't important.