Kendall Jenner: Driving My Precious Ride Ain't Easy!!

In the time it takes Kendall Jenner to make a U-turn in her classic 1957 Corvette Stingray ... you could raise a family and solve world hunger.

Jenner went full grandma driving her gorgeous whip -- babying it so much she had to enlist outside help just to get going.

We'll say this ... at least she treats her ride -- which she bought for her 20th birthday -- way better than Kylie treats hers!