Replying to Speeding Ticket

So i got this ticket on saturday and now its tuesday for going 59 in a 35, downhill. I didnt even realize i was going that fast and i was surprized when the officier told me. I havnt told my parents yet. I had just gotten a grand prix gt after having a truck for a year, so i guess my parents trusted me enough so i could get a sporty type car, red by the way. And of course when i got it my parents were like "dont get a ticket". So how do i tell them? i decided to put it off until after my (18th) bday which is tomarrow...