Authentic people don't laugh at jokes they don't think are funny. They don't change their identity, like chameleons, depending on who they are with or where they are. So, if you want to grow as a person, take time to really know yourself. If you're not completely happy with what you find, don't worry too much. Work on accepting yourself for what you are, right here, right now, and on being truly authentic.
Carl Rogers, a world famous psychologist, once said that when we accept ourselves exactly as we are, change becomes much easier.