The feeling of needing to belong is part of the human condition. It's realizing that you don't NEED to belong to be accepted that is freeing. 
I've always told my kids that there is no such thing as normal because my normal and your normal and someone else's normal might be three different things. Learning to accept these differences as necessary in life is paramount. This is where we learn that belonging and being accepted are not the same. This is where we learn to be comfortable with our own company. When people see that you are happy and content to be yourself and be by yourself, they get curious. They want to know what you know.  Don't apologize for being human, friend. We all are. Just be the best human you can.