I agree that most of the people I meet aren't going to be my friends, but disagree that they aren't worth being friends with for someone else. Most of them have got other friends. They're still worth something even when I don't have enough in common with them to want to hang out. I'm better than them at the things I'm good at, but they've all got their own strengths where they must surely outdo me.
I can't tell if you're from a different culture, carry some trauma, expect an unrealistic level of commitment, or something else that would cause us to have such a different outlook on life. I'm sorry that you've been let down by other people and I hope things get better for you.
Healthy communities exist. They are increasingly rare due to the massive shift in the way of living, but they do exist.
1. If the community has "healing power", it can accept new broken members as long as they don't overwhelm the support system. Many hippie and religious movements work with some version of this idea.
2. A struggling loner might be so because of traits unattractive to general society, but attractive to the community. Pretty much all subcultures fit here.