You are his child, being taken care of financially should not incur guilt or shame.
Providing for a child is the consequence of the choice to bring the child into the world, it’s great if the child is grateful, but it does not give the parent any special rights against the child’s mental or physical health if the child has grievances.
Abuse is the wrong action, even if it comes with a laptop or a steak dinner.
Hang in there, keep your eye on the light at the end of the tunnel.
Is your brother resilient as well?