... and it isn't always bad to not belong. Maybe you need to find a different group to belong to, or people that are more like you are. It is good to feel independent sometimes. It helps us to learn self-reliance, and reminds us about what things are really important to us.
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well, it can be relative.
Not belonging, generally is a feeling that doesn't stay to long. It comes once in a while when you feel depressed or sad, but evetually goes away when you win your day.
But it normally arises when you don't understand what surrounds you, don't quite understand why the people you know do certain things, and find it hard to fit in with society since you don't agree with what it states and defends. You should really find out more about yourself and explore your thoughts, what you defend, build up ideas, and listen to other peoples ideas, so that there can be discussion and development, because it is nice to sometimes have different ideas about a certain issue. Like this you will find yourself more confident around other people because you accept yourself and you accept everything that surrounds you even if they aren't like you, making you feel less depressed, and finally you actually fell that you belong there, because you realized that you don't need to be like others to belong.