I wanna forget my surprise party?

My 16th birthday is coming up and im 99% sure my parents are throwing me surprise birthday party cuz i say the invitation cards today and my dad saw me looking at them.(he gott alittle upset)...and soo im pretty sure there throwing me a party and im upset now cuz i want to be surprised and iwant to forget all about what i saw but idont know what to doo...any ideas or advise?