Being More Mature

I always feel like I am still a little girl in some perspective.

Two years ago, when I was a counselor in an English camp of YWCA, one of my team members said that I am not as mature as another counselor who was one year younger than I was. She moved to New Jersey ever since she was fourteen years old, and she lived alone.

Now that I have thought of it, I really feel ashamed of myself. How can I behave like this? I am old enough; I should know better, yet I do not look like what people in my age should be like! Does that mean that I am still very childish in some aspects?