i passed a hearing test but can't hear

hi everyone,
i'm seventeen years old and recently I've started to notice that my hearing isn't as good as other people my age/older (its worse than my 70 year old grandads). It took me about five months to get an appointment with audiology where i did the bleep tone test and was told that my hearing was within the normal range for an adult (i am in the process of getting the results on paper because my GP surgery hasn't received them yet (its been over a month)).
I dont really know what to do, i don't understand how my hearing could be considered good if its the same/worse as someone who is older than me? it seemed to me like my audiologist didnt care at all and its really grating on me - i feel like a fraud saying to people that i have bad hearing because from an audiologists point of view i don't.
any advice?