I don't believe that suicide is someone's destiny. If you are born you're meant to stay alive until death happens on its own. You can't be born and destined to kill yourself - if you're born you're meant to stay alive otherwise it would be complete contradiction.
If you don't have a purpose then find one. Nothing is just going to come to you. Complaining and doing nothing isn't going to do anything. Have you actually done something differently with your life recently? Or do you just sit and complain and do the same thing?
If you want a purpose, then help people. Go volunteer at a hospital, animal shelter, nursing home, children's hospital, anything that requires volunteers.
Make your purpose to help others and get the satisfaction of helping them. Do something and don't put your life to waste. Do something different from the ordinary if you want change.
Bottom line is what you want out of life is up to you.