I am a hard working guy

I grew up as an only child. Since both her parents didn't have any siblings either, Christine also grew up as an only grandchild. She grew up in a small neighborhood with adults—her parents and grandparents.
Because of this, she never really knew what it meant to be a kid. Since the adults around Christine were quite overprotective too, she didn't learn how to relate well with other kids.
Growing up, Christine felt accustomed to the company of adults. She was always more mature than the other children at school. Even when she gained friends, she often felt annoyed at them while growing up because she felt that they were too childish.
The adults who raised Christine had invested a lot in her—this encouraged her to excel in all of her subjects as well as any hobbies she decided to take up. Now that she's all grown up, accepts that back then, she may have seemed smug to her peers.
While she didn't realize this back then, she hadn't learned self-awareness until years later. When Christine was in high school, she started feeling the pressure from her parents' and grandparents' high expectations. Gradually, she stopped joining extra-curricular activities and instead, made the choice to work.