Is it primarily through our identification with social groups that we define ourselves?

In any Society, through interaction amongs differents individuals, people identify themselves in a certain group. For instance, in a classroom, usually each student has an unique student number, by accepting such a number, every student has a valid identification in the class and thus can conduct daily learning activities.However, that doesn't mean we at the same time define ourselves or find our existence through identificaition with social groups, on the contrary, we can easily …

…conclusion, given the facts that every people has his/her own social group, he/she still can keeps their intrinsic ways of behavior and thinking. They define themselves not only on their groups but also by their own traits. Furthermore, even the definition of each individual is not fixed, on the contrary, such a definition keeps changing all the time with the development of individuals in their social position as well as their own characteristics.