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As for the driving thing, we could talk all day about the different rules imposed on younger drivers in different states, and debate their effect on accident rates and the like.
But to an extent, that is what you and your sister have been doing. She objects to the laws that govern how many people (and their ages) she can have in the car with her when she drives. It sounds like that battle will not end, not even when both of you are above the age where these restrictions apply.
Moving forward will require some help from your mother, but you will need to decide if you are willing to ride with your sister when she has "too many" people in the car. Obviously you will not be able to enforce that rule on her by yourself. If your mom sides with you, then expect your sister to hold it against you. If your mom sides with your sister, then you will need to decide if you can accept it or not.
A long time ago my wife and I went to baseball games with another couple. They drove far more "parking lot aggressive" than I feel comfortable doing. It got to me every time until I accepted that if he got in an accident it was his car that would be damaged not mine; and that the worst I would suffer from such an accident would be a delay in time getting out while he exchanged info with the other driver.
Once I looked at the real risks and who would suffer the consequences I was able to relax.
Do you think that this extra person in the car makes an accident much more likely? If you get stopped and she gets a ticket for driving with too many under age people in the car, will you suffer any consequences?
Gentle hugs
Sisters aren't there to be loved or friends in teenaged years. Sisters are there to show us a real relationship.
You are far too invested in your sister. You're too involved. Who cares who she puts in the car. Who cares if she breaks the law? Not your law. Not your job to enforce it. Why care. But you care. You're in her pocket. You're unnaturally invested and you're being that priggish little sister that gets thumped a lot.
Your relationship with her will come into its own in your 20s. Not your teens. Teens are the years you need to learn her boundaries and she needs to learn yours.
As to hitting: people can wank on about how nobody should ever hit you and all that will do is make you feel humiliated and like a failure because whether it should or not, it will. And there's nothing you can do to stop it except by your own actions. If she hits you, hit her back harder, every single time. But never hit first. If mum punishes you? look mum in the eye and tell mum she's going to have to get used to it because you're not taking any more hits from anger management girl. If you get the belt for it, take it with a smile and a thumbs up to sister. Teach sister the old way, the way we all used before the 'anti smacking' brigade came in, how to respect your boundaries, by defending them no matter what.
So defend your boundaries, but respect hers. Stay out of her pocket, and don't let her into your pocket. Earn her respect, and have some for her. Friendship will come later.
Don't be self-conscious about crying. Everybody cries. It's nothing special when you cry, by which I mean it's nothing to cry about. If that makes sense. It's just a survival mechanism your body is using for emotional stress. So do it unselfconsciously.
People who get tangled up in how much they are crying will escalate how bad they feel. Because they are no longer just feeling bad; now they're feeling bad about feeling bad.