I think you're in the clear. If you are extremely egotistical, arrogant, or prideful people WILL let you know. You either are humble, or somewhere down the middle.
I already know I am extremely prideful. I don't take no for an answer. And I ALWAYS have to be right. It's a quality my current girlfriend has told me she hates about me, but has learned to deal with. On the same token, I think she likes playing the passive roll and making me think I'm right all the time. I guess I've just been used to having people do this my whole life, and I got used to it. But back to the issue at hand, I have been told this by many people. So I think if you're arrogant, people would let you know.
Why the sudden interest anyway? Did a girl say you have a big head today or something?