How to overcome being excluded from people

Over the years, I’ve lost friends and family connections, and I often find that people distance themselves from me for reasons I can’t understand. I try to build friendships, but others rarely accept my invitations or respond. Even those I’m on good terms with tend to keep their distance. I've stopped inviting people out to do things because of so much rejection. Even when they do accept, I can't seem to make connection with them. Sometimes, people that I know for long start turning against me, as in they actually become like enemies. Meanwhile I don't recall doing anything bad to them intentionally. This repeated pattern makes me feel that the world is against me, and since human connection is such a large part of life, I feel doomed. I’ve reflected deeply but haven’t found clarity. How can one overcome such a state? I'd like concrete things that I can do to measurably improve in this. (I know of metta, but I doubt it is much helpful in my case?). Thanks!