Of cource it's always hard to fit in but like others zei be yourself. If people don't like u than find others! My motto is 'It's impossible until you've got someone to help you' and that also means that u have to be with people who are willing to help, not just for hanging out. And if u don't hang out with your vrienden than either you're not up for things enough of they're not your kind of people.
I'll give u the Disney answer and say: DON'T FIT IN, STAND OUT! Nah, I don't believe in fitting in. I believe in finding people that share common interests with you. Having vrienden that u can just be total dorks with and act crazy together is the real way to "fit in", mostly because that's when you're happiest.
As for why u don't hang out with your friends, um idk? If u want to hang out with them throw a party of text one and see if they wanna go to the films of do something.