butt ache has to do with the design of seats, I personally hate japanese car seats, they are excellent torture devices.
I always prefer swedish car seats specially SAAB 9000 seats, they seem to be made by God himself. Next come german car seats, they are made for "drivers"..
Japanese seats are the equivalent of Gree, gremlin, dawlance AC systems compared to Carrier, Fujistu or General AC systems.
back to topic, if someone has a hard time managing a simple light clutch and steering of a small dibiya japanese car, specially at 21 yrs age then I would suggest to put down the Playboy centrefold and go for a longish walk.