My, what a hot little psychological pressure cooker that home must have been.
Just imagine: The person with the most power over you intends to crush your life plans by having you committed. You hate the idea of being confined and drugged, that's a living nightmare, but what YOU want counts for precisely nothing. You're just a boy. After you have been committed, you know that you will never really be accepted in society. You'll always be the freak, the outsider, for the rest of your life. That's what mommy wants.
She has all the power, and she intends to use it against you. Is there any way to stop her? Well, actually, you have access to her guns, and since your life is already forfeit... Pay her back, and make some innocents pay for your own lost innocence. Do something to make this miserable world share and understand your private hell.
Your post sounds like you are too close to this situation and you made the hairs on my neck stand up. Get some help!
Perhaps you should review the definition of insanity.
It is quite similar to the definition of cognitive dissonance.
That’s probably pretty much it in a nutshell. The one thing you left out was that he had some serious mental/emotional issues to begin with.