I had trouble making friends period. I had a few acquaintances that I would hang out with when I felt the need for social contact, but I much preferred reading to people. My parents would often take literature out of my backpack just so I would have nothing to read at recess; that made me miserable until I figured out to stick books in a pocket or sweater.
The thing is, psychologists seem to think that everything ultimately screws up your child. My mom read up on way too many psychologists without really digesting and interpreting the meaning. That's why they still think it's ADD not AS, when stimulants just made me sick. Personally, no friends is a huge problem; no friends of the same sex isn't. If anything, it gives them a better understanding of themselves and of the opposite sex.
I can tell you that I didn't have close female friends until I was sixteen years old. Even then the really close relationships didn't start until I went to college. Before then, all girls wanted to talk about were boys and gossip, even at eight years old. I got teased because while they were into that, I was into cooking, science, and reading, especially about cooking and archaeology. They targeted me because I was different; I was poorer than most of my classmates, so they made fun of my clothes for being homemade; I had a mother who stayed in bed and would yell at us not to miss the bus from her room, so they forced my mouth open to see if I had brushed my teeth, count my cavities, and show how stained they were. Frankly, I'm glad I didn't wind up in that group now, because I may have turned out like them. In high school, my classmates loved my information retention, except when it destroyed grading curves. Fellow female students would often ask me to dumb it down on group English projects because I would see a set of words that defined a single word and would replace the phrase with said word.