Don't be mean or rude; you do not want to lose any potential friends. Be nice and friendly. If you want to make friends, you first need to put yourself out there somehow in order to meet people. If you just sit alone, friends might come to you, but that's not likely. If you're still in school, sit somewhere with other people. It doesn't have to be the "popular"/ "cool" table, or a crowded one, but one with at least two other people. Hang out with many others. The popular kids won't matter when you're older, but a true friend will be there for you forever. Remember, friends seldom come knocking on your door while you sit at home playing on your laptop. Popular people aren't always going to be mean to you. They just need to know you a little better.