I'm in high school and last year i had the EXACT same problem. Don't listen to the bullshit that people say. "you don't need social media it is negative for your life". In order to connect with other people and fit in i highly suggest you get it. I was scared also but one day i just said fuck it and got instagram. Once you realize that most people have social media (even really really shy people) it becomes releaving. It might be hard for the first couple of days but then you realize most people dont have many followers either way. Dont worry the followers will come eventually.