I am Black But Beautiful!
Rebbe Nachman of Breslov has a Teaching (famously referred to as Azamra) regarding Judging people favourbly.
He says that if you judge someone favourbly, concentrating only on their good points rather than their bad ones, you can actually move them out of where they are holding now.
Is it possible that your son has never done anything good in his life. Has he not done mitzvos, learnt Torah, given charity, said good morning to you, worn a kappel, tsizzit, put on teffilin. Did he ever help you set the table for shabbos, made brochos etc.
You should spend some time every day thinking about how wonderful your son is.
An example given by Reb Noson of Breslov about this Teaching is that, The Children of Israel made the golden calf and worshipped it. But they also built the Mishkan. I am Black but Beautiful says King Solomon.
Your son is beautiful – go and examine his beauty!