Basic human contact - the meeting of eyes, the exchanging of words - is to the psyche what oxygen is to the brain. If you're feeling abandoned by the world, interact with anyone you can.
From the time I was a kid, I'd never joined groups. I hated high school groups. I hung out with hippies, musical people. I hung out with whomever I found compelling and interesting and smart. And I continued to do that throughout my life.