You don't live for others, you live for yourself. The injuries and the pain doesn't matters(to a certain extent), what matters is who you are at the end of the day and how strong you have been till now. Take a moment to look in the mirror and feel proud that after all those scars, bruises and injuries, you've made it. You scars tell your story. They are a reminder of how many times life tried to break you but failed. Miserably. Things aren't going to get worse. You want to kill yourself. That is as low as it gets. There is only upwards from here.
But in the end its your choice.
Take a moment,
Breathe,
And decide.