Of cource it's always hard to fit in but like others कहा be yourself. If people don't like आप than find others! My आदर्श वाक्य is 'It's impossible until you've got someone to help you' and that also means that आप have to be with people who are willing to help, not just for hanging out. And if आप don't hang out with your फ्रेंड्स than either you're not up for things enough या they're not your kind of people.
I'll give आप the डिज़्नी 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 फ्रेंड्स that आप 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 आप don't hang out with your friends, um idk? If आप want to hang out with them throw a party या text one and see if they wanna go to the फिल्में या do something.