I have friends, but I don't see them all that much right now. And I actually quite like it this way. Before I ever had any friends, at age 9 or so, I wanted friends really bad. At age 12, I got them, and kept them, and they were hard work to be honest. I have fun when making jokes with them, and they had a good sense of humour, but in the end, I really prefer being on my own. Being around them a lot mentally exhausts me, but when I'm not around them, I don't really miss them.
Same thing with relationships. Before I ever had one, there wasn't a single thing in the world I wanted more. I've had two now, and came to the conclusion that I'm better off without. Relationships take a shedload of time and effort, and it simply does not weigh up against the "benefits".
The only way I can ever imagine myself having some sort of friendship or relationship in, is when not much is expected from me. Phonecalls, questions, invitations, they drive me mad. Once every two weeks is more than enough.