i looked up lease agreements and found out what i could but i don't get it, if you lease a car and don't own it cuz you are leasing and u can't afford it anymore is there anyway to give it back and shit?

cuz leases are supposed to be for a certain amount of time is what i read, but like u lease a 12000 dollar car and its now worth like 5000 and u dont want it anymore but u payed like 5 on it already, are places supposed to help u out or are they allowed to be ass holes and u just gotta go to collections and deal wit it that way?
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its not my car, i would never lease, but still anyone?

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