Sense of not belonging

You do not have to feel like you belongs to live a happy, successful life on earth. I have never fit in anywhere and it doesn't bother me. I run alone. I gather tribe who care for and who appreciate me. And likewise. You are old enough to understand this. Make friends. Or be alone. You have to rock your own life. Do not compare yourself to others. Each person is struggling and many feel like you. They just hide it well. Are you doing volunteer work? That focuses on someone else other than you. Are you pursuing what makes your heart race? Your interests. Your hobbies. Your passions. Try that and then fitting in will not matter anywhere near as much.