What does it mean if a classmate thinks Im astute?

Question

What would make my classmate think that? I don't show off in class.

Update:

But I don't think I'm explicit in assessing situations though?

Answer 1

It means that they are dead wrong. 

There is nothing astute about you if you need to ask.

Answer 2

The question is should you really take this into your consideration kid?

Nope.

Answer 3

Astute - having or showing an ability to accurately assess situations or people and turn this to one's advantage.

It doesn't have anything to do with showing off. 

Maybe he was just flattering you.