Hi Alisa, I am offering an interpretation for your dream:

Being in school suggests to me that this is a life lesson.
The vehicles both represent your body and your "way" in life. The one you prefer, being the truck, is sturdier, a "worker", tough, can handle the hard jobs. The car, which is pretty much forced on you, is out of repair, needs lots of work, and you don't even really want it. Is someone telling you to lose weight, or change your body or mind about something? You feel pressure to change something important to you, and you don't want to. Noone will listen and you feel abandoned. You need to talk to someone, in order to get the release the pent up feelings.

I know the interpretation sounds alot like the dream, but esentially that is what it's telling you.