How does a deaf person get told they are deaf?

I was not born with my hearing loss-I am post-lingual bi-lateral mild-moderate permanent mixed hearing impaired--Say that five times fast! Personally, myself and my parents found out when I was in elementary school--there were a few signs: I'd either yell or whisper, I didn't respond to people if I was turned around, etc. I was tested, and they diagnosed me with a hearing loss, after which I was fitted with a portable amplifying system to use in school. Later, I received hearing aids and a ALD (Assistive Listening Device) that my teacher wore to increase the volume of his/her voice in my ears. At the time, I kind of understood it. I was old enough to know that some people were deaf, and knew a few adults who were, but didn't quite understand that you could be kind of deaf.

Even now, it's something I struggle with. It's quite difficult to understand that there are things you cannot sense that others can. The easiest way I've found to explain this to myself, past the concrete examples of dissonance (for example, there was a popped tire on my car, and my brother could hear the air whistling, but I couldn't), is through similar experiences--for example, if I can acknowledge color blindness (which a close friend has), then I can understand that we don't quite see the same things. Therefore, it's easier for me to accept that I can't hear the same things as everyone else. Truly makes you question your perception, hunh?!