I have barely enough friends to count with one hands, and even then those friends are not very good ones (they are often busy a LOT, ignore me a lot, don't seem to want to talk, etc.)
So as a result I had to learn to be self sufficient because I know if I gotta count on a friend to do anything for me, they WILL let me down because normally they are not very serious about it.
Sometimes I'd trade anything to be a NT...