...do something about this NOW! If you are young and having this problem, I can tell you that it only gets worse with age!!! Make it a point to cultivate some friendhips...take classes, get a job, volunteer, pick up a hobby...anything to put you in a position of meeting people who share similar interests and values.
I love my alone time, too...and agree that it is better to be by oneself than with others that you don't want to spend your time with. But find a way to meet people that you want to spend time with! Especially as you get older you will be glad you did!