Why you need to let go of things? Things that are bad to yourself and things that kills you in no time.

Everyone has many things to deal. Some are depressive and that's where you need to let it go. It's not healthy for your mental health and spiritual health. It may lead you to kill yourself. 

And also, you need to deal with it first. Because it helps you grow, it helps you to know yourself more and there, you can love yourself.