Before I leave for the day, I'm going to put a shirt on my son and tie my son's neck to a metal pipe.
That sounds messed up. Why would you tie your son's neck to a metal pipe? Is that to prevent him from running away?
It hurts me to do this, but what does he want from me? He always complain about me never doing anything with him
Maybe the fact that you have him tied up makes him feel that way? It's pretty uncomfortable to be in a situation where he is confined to a small space. You should not keep doing this because it's abuse and you will either go to jail or lose your son or worst, both.
Do you think I'm a monster?
The plan for your son that you're describing does sound horrific. If you really consider doing things like that then I think it would be wise to get some counseling before you hurt your son.