If you want to have a car that you can ride on vanilla survival mode then listen up! All you need is a pig a saddle a minecart and a few rails. first  you place the rails and put the minecart down then you put the pig in the cart with a saddle on it. you then ride the pig and you should move striaght forward the turn controls are inverted from normal controls. have fun bros

what about jumping for hills is there a way to do that?

No, you can only go down hill. Even then its little risky.

The cart keeps moving but only in 1 direction

I cant figure out steering

I think this might have been patched. I don't know though. If the steering is a for right and d for left. If it still doesn't work then it might have been patched.