I'm sorry you feel that way XPeterX, I've been feeling lonely at the hall for 10 years and was sticking it out, hoping my prayers would be answered too.
When I was a teen, my friends stopped hanging out with me because they were leaving the organization and getting into trouble and didn't want to involve me.
As a young adult, unless you're "in" with the social clique, you don't have much chance for any invites if you're in an unsocial hall like mine. Growing up we'd have dances and picnics, but that all stopped when some elders got too carried away imposing rules. The fun stopped...no "decades" or dress up parties, etc.
Being an adult can be a difficult time. Your good friends could have moved away, or you have different interests and priorities and just drift apart. Finding new friends can be easy though, just join a community group or program like a hiking or run club (whatever you're interested in), and you'll make new friends in no time.
If you still believe in God, I would also recommend reading the Bible. I have found more comfort in the scriptures now than ever before. And I've found new Christian friends that I can talk about faith with who don't judge my ideas.