"She may be two years older, but she's not two years better."

I have a brother who is two years younger than I am. One night after I was supposed to be asleep, I heard my dad and brother talking downstairs. I opened my door so I could hear. 

They were talking about academics and our respective intelligence. 

I heard my dad say, "She may be two years older, but she's not two years better," and then he and my brother kind of chuckled. 

This really hurt because my dad and I are really close and I try so hard to impress him and to make him proud. 

It just made me feel like no matter what I do, it will never be more impressive than what my brother does.