Assuming that you've checked that you're not actually repulsive (halitosis, habitual drooling or unchecked running nose, pants hiked up to your rib cage and sme

Assuming that you've checked that you're not actually repulsive (halitosis, habitual drooling or unchecked running nose, pants hiked up to your rib cage and smelly, unwashed shirts), then it's most likely that you're just not finding the kind of people with whom you have chemistry. I felt rather similarly in my early and mid twenties. I didn't click with people, and it always felt like too much effort to socialize. Then I moved to the Bay Area and my life changed over the course of two months. I finally met people with interests and goals I could relate to. For what it's worth, if I were doing it again now, I'd move to a great city and exploit things like Meetup.com, get out, and take up every class and activity that so much as caught my eye. Remember: to be interesting, you have to be interested.