I believe I can help you with your concern
I can understand your concern about your son and his asocial behavior.
May I ask, in high school how did your son behave and interact with others?
I would like to ask you a few questions about your son, so that I can get some more information and better assist you
How does your son take to criticism? Is he very sensitive to it?
Okay, does he express a desire to make more friends or not?
And when he interacts with others, does he have a difficult time understand other people's emotions and sarcasm?
And the last question, when in a social situation that he may feel uncomfortable with, has he ever had extreme anxiety or even a panic attack?
I can see why you are worried, but it appears that there are two possibilities for his behavior and neither are that serious. The one I am really leaning to is that his temperament is more introverted and he prefers solitary activities and being alone with his own thoughts. The other possibility is that he has some traits of Avoidant Personality Disorder (AVPD), but I do not think this is the case as he does not appear to be sad or avoiding others for fear and can spend time with others if he chooses, but he chooses not to
Still with not being as social in college it could have an effect on future social and intimate relationships where he may be deficient
This just means that in the future he may have a harder time to form social relationships with others, but he may not want to and instead may only want to form small and few social attachments.
You say he is very empathetic and I am sure he gets along with everyone, he just appears shy and that may be the case. But if he is happy with what he is doing and can still converse with others in a meaningful manner, then I think he will be just fine
I think you can let him be for now, but encourage him to do joint projects with others in his class or go to parties/get togethers for himself
I would not push him and it sounds like he is just an introvert by nature, but this is not harming him psychologically at all
Anytime, is there anything else I can assist you with?