From what you describe, it seems he does have quite a few personal issues. We cannot blame it all on addiction. Sometimes the insecurities, dilemmas, life problems, stressful situations, and not knowing how to cope with them may actually lead to substance abuse. It just seems that he is a deeply troubled individual who yet has to explore who he really is, what he really wants, and what will make him happy. And he might also be severely depressed.