I've got two cars far apart on the appeal scale. One is a '88 Honda thats seen better days (work and back car). The other is a Lexus. Now I've taken girls out in both cars, and for me anyway, they really don' care to much about which car I take. They are happy to be with me, regardless of the car we're in.
As Frivolousz21 said, don't worry about it at your age.