I'm like that also. I used to justify myself for being alone. But now as time goes on and Im getting older, I can't stop thinking how I missed out on other things normal people do. As one ages, the more depressed it gets. I'm 26.
How old are you?
If you are very young, it doesn't affect that much, but once you get to my age, you start wondering where you would end up in the future and start getting insecure.
Maybe we don't have friends to have any opportunity to go out and do stuff. Making friends is the issue.