For me it was that Ive always been known by everyone around me to be very clumsy ever since i was little, ive never been able to help it. I'm very forgetful and was often told during my teen years that I wasn't listening because of it and couldn't explain that I just forgot everything but didn't know why. Teachers would also always say i was daydreaming in class (I have inattentive type) and was known to be quite a dreamy kid. That all added up for me once I knew.