Hi Shuiyan
Perhaps you wanted to say cheap as in the retail price of the car. I can understand some people struggle with the english lang. As for the height, try your height adjusters on your drivers seat, a low sitting position also gives you a more sporty feel when you put your car on the twisty bits like the mountains. Don't bother about those guys, they're just being stupid. Have fun with your bimmer.
Gruß,
Daniel