The reason I never made a social media account, even in high school, is that I was worried that only a couple people would be my friend on there, and then everyone would be able to clearly see from my # of friends that I'm a loner.
This is the same reason for many other things in my life, such as why I never had a birthday party. Even as a kid, my parents would start planning a birthday party for me and I would tell them "no no! I don't want a party". They never understood why and thought it was strange, but the truth is that I didn't think anyone would show up and that would have been embarrassing.