Ever since around age 13 (9 years ago) I have felt extreme car sickness within ~10 minutes in any car, and within ~15 minutes in some buses.
The only way I can travel without throwing up is via train.

My main problem comes from people thinking I'm full of shit when I use it as an excuse, until I fucking throw up all over their dashboard or out the window.
So, what is this condition called? Is car sickness that only sets in during adolescence a thing and how can I shut these people up without ruining their car's interior?