Two things serve as fuel for the will: anger and hurt feelings. Young people show more emotions, but with age, human logic lowers the level of emotions.
In order to overcome your fear, you have to trick your brain. I will teach you a method, maybe you will find it useful. Method : First: promise yourself that you want to simulate the act of hanging and that you do not intend to commit suicide. Second: consider the necessary facilities and the right time for this and perform the hanging completely as a test and put yourself in the position but do not kill yourself, do this as a practice several times in a few days until Let your brain get used to this situation. Third: You can make a kind of knot with a strong thread to tie your hands behind so that in case of suicide, you will not be able to save yourself, this can give you a sense of confidence.