I think I'm going to kill mysslf

I feel a heaviness in my chest, a fog that does not dissipate. I feel unreal, I feel without desire. There's a nagging voice in my head that says it's best to leave the world because I'm not good at anything. Is too late for me? I wouldn't like it to be too late for me, it doesn't make sense, I'm very young, but I've already failed.

I don't have a date, it's nothing very premeditated, just a thought that invades me.