Do you WANT to be social or is there an obligation you feel that you're "supposed" to be socially active? Because the truth is, you're best being what you are content with, comfortable with. Sure there are times when social activity is inevitable but I don't think that's wht you're talking about. If you're happier being alone, live your life as you see fit, and don't try to conform to what the world says about being social. You're not a lesser person being drawn more to solitude than socializing.