I used to be sad and sorry with myself too because I'm not sociable, I have few friends, I seldom go out, not up to date with the latest gossip, etc. But now I'm over it, I realize that being loner and not sociable does not make us a bad person. We are just socially incapable and that's not a fault, it's more like a trial that we have to bear in this world. And believe me that everyone has their own trials and problems, even those who looks like always having fun.
I'm now able to accept myself, though fear of social event and others still there, but at least I don't feel bad about myself. You don't need to, it's just add to your burden. If you never mean to be bad, then believe that you are not a bad person.