By being unhappy, he feels more secure. "Mom, see? how hard I'm trying."
If he ever tried to be happy, he feels uneasy.
He needs to be aware of his everyday thoughts, And question why he feels or thinks certain way, instead of just a reflex.
Self-awareness is a sign of maturity.
Knowing the problem is half way toward solving it.
Realize that reflex conditioned since childhood is very hard to change.