I can't offer you too much on this as I have absolutely no social life and haven't encountered this, so i could only offer ideas. Maybe they are just very busy and caught up in their lives, work and have a lot going on. but they are missing out. I'd be very lucky to have you as a friend. I'm sorry I can't help you more.. I just don't have much experience here either. Is there maybe some other ways you could try getting out and meeting some new people? Make some new friends? Dating? Safely, of course