What makes you introvert or becoming to or in nature?

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I was wandering why I am being alone person or enjoy the loneliness, why i like being in small group and love to spent. As the times goes by and ages, I start liking being alone, doing anything alone but I know every time alone is not good idea. sometimes I feel so un comfortable in crowd and in groups of friends seems, sometime people like to eat with friends off course I do too but in reality i love eating alone and enjoy outing too. I am not sure , why i get irritated very soon... Sometimes I planned for something to do with group but I always end up canceling the plan and if its happen to cancel by other I love that too I think I am introvert person... I wish I am extrovert person like others @