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How can I finance a used car with poor credit and no down payment?

I have an old used car with 200k miles I had it for 10 years. My credit is poor like 550-600.
2 years ago I used my $1k I got from taxes as down payment for a new used car. I cudnt afford the $400 payment so my parents took over the car.
my car has an oil leak, and mechanic said we might need sell it and car is dead now. No longer can be fixed. I can’t get a new car , I don’t have $1k down payment, I’m living in car , and have to use all my money Oct for my studio. Won’t even have money for my bday Oct.

mom wants help by using her good credit get me a new car with low monthly payment, but it’ll be hard beg parents when we’ll go to the dealer? When we’ll get a new car? They love seeing me broke and control me. So I don’t want that. What can I do?
I’ve seen online used old cars for $4k, I can’t just pay Monthly and get a cheap car like that? Or they will also demand $1k or more to get the $4k car on my own?
I got a new part time job rn , but I might get a full time job and a studio that’s 5 min by job and beach. So this way I don’t spend gas any more. And barely drive the car.

Updates
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I can’t buy a used cheap car as my parents will be Furious forcing me get a new car and pay $1k down payment and will call me stupid idiot. So I’m scared and hard make any choice on my own even tho I’m 28.
I was barely trying be independent by living alone in my car by job for 2 wks now in peace.
How can I finance a used car with poor credit and no down payment?
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