Why do people say that you will go crazy if you never make any friends?

I've never had a friend before. Frankly, I find it a waste of time and to socialize about the trivial things of our society (sports, movies, gossip, etc.). I've always enjoyed the company of my own textbooks, and spend my free time either studying for hours on end, reading research papers published at local universities by professors, or watching documentaries. I am quite content with my life and am happy without friends and have always been. So, where does this myth originate from that one must need friends to stay sane and mentally healthy?