Believe it or not there are other people are on this website right now! Don't get to overworked about all the people who are on here. If you are antisocial and don't want friends then you don't have to have friends but, it's nice to have at least one friend on here. If you post on the dashboard then follow the people who like your post (look at their profile first) and also follow the following: anyone you know in reality who is on here, headmaster/headmistress, deputy headmaster/headmistress, and all of your professors. If you follow them then you will probably have a few friends by then!
You can view all of your friends by clicking on your name and then clicking on the "my friends". The dashboard, great hall, and forums are great ways to make new friends. Your classes are also a good ways to make friends. Remember, these are real people that have emotions so make sure you are being kind and not mean or rude. I'm a real person and you probably are to!
Most of the people I follow are my professors. I also follow the headmistress and deputy headmaster. It's okay to start out like that plus, it gives you a chance to get to know them!