Self reliance, like the pioneers. When your not living around a support structure and have distanced yourself from it, it naturally tends to distance itself back. (I do not do social media, and my closest friends moved more then 20 years ago, heck to even communicate with their sibling who has been a stalking victim, they require FB communication).
It also doesn't help when your at far different ends of the financial spectrum. I have another friend who is a decamillionaire and travels all over the place.
Another aspect for me has always been being at different points in life. My friends were an average of four years older then me and that is far enough apart that while they all celebrated birthdays such as 21, since I was both younger and not a drinker, when mine came around, happy birthday, wasn't even a thought. They started families, and were freaked when I being younger, was the second homeowner of the group.
So keep yourself active and realize your asking others to live their lifes filling your demands,"
"...Just being ourselves is the biggest fear of humans. We have learned to live our life trying to satisfy other people's demands. We have learned to live by other people's points of view because of the fear of not being accepted and of not being good enough for someone else."
- Don Miguel Ruiz, The Four Agreements (A Practical Guide to Personal Freedom)"