The loneliness probably comes from the fact that any kind of mental development will only bear fruit that you can see. If you were creating art, you could show it to other people (though, that's also a rather lonely pursuit, haha). You can't show your meditation results to anyone but yourself.
This is probably a valuable teacher, though. The results of meditation always seem to point towards ordinariness. The more spectacular the special effects or the bliss, the less likely it'll teach anything valuable. I feel like the only valuable thing I've gained so far has been simple contentment. Contentment, by its very nature, isn't very spectacular, so it's hard to share it with anyone, haha.
Just realize that the greatest fruit your meditation can bear for other people is the patience and kindness it helps you develop. If you want it to be a less lonely path, allow it to bear fruit in that direction.