How do I explain to my parents that I need a fancy car?

They are getting me a car for my 18th birthday next year, but they are getting me a frigging honda civic. I really need a nice car like a mercedes so I can pick up guys on dates and they will be impressed. If I pick up guys on a honda civic that won't be as nice you know?

Troll, troll, troll your boat…

You have to distinguish between genuine "needs" and "wants." For example, I need healthy & affordable food. But I want expensive sushi & sashimi.

Boohoo! Nobody here will feel sorry for you, troll. And if you "impressed" the guys, they would be picking you up. You must look like a troll.

Since when did a girl need to impress guys or pick him up for a date. Is that not a little backwards?

Then… YOU PAY FOR IT. Done deal.

The guys you pick up in a Mercedes will expect you to buy them stuff. Guys you pick up in a Honda civic will buy you stuff.

Work on your self esteem and self confidence.

First you should subscribe to fancy car magazines, then tell them.

You CAN'T because they know you DON'T actually need a fancy car. In fact, given your stated reason, they should buy you a BICYCLE instead of a car.