大人になんてなりたくないって英語でなんて言うの？

If you every have heard of the story of Peter Pan, there are children who say that they 'never want to grow up' and would rather 'stay children forever'. If you too would like to express this feeling that you don't want to grow up, say the following: "I never want to grow up." "I don't ever want to grow up." "I'd rather not grow up. I want to stay a kid all my life." If you want to sound more sad and sulky, add the phrase "I know it's sad but..." before saying the sentence "I never want to grow up". For example: "I know it's sad but I never want to grow up"

"Adulting" is more of a slang word, most often used by younger people (young adults). It refers to having to do adult things, like paying bills, going to work, etc. Saying "I'm tired of adulting" means you don't want to do those things anymore.

When you grow up you are also called 'a grown up' or an 'adult' so if you don't want to become an adult then you could say 'i don't want to grow up' or ' i don't want to be (become) a grown up' don't is the same as do not.

The simple translation is "I don't want to grow up." That's just a synonym for "I don't want to be an adult." To "grow up" is to get older. But "adult" refers to more than age. With adulthood comes all kinds of responsibilities, most of which aren't fun. So you probably mean "I don't want adult responsibilities" or, if you're being honest, "I want to be a teenager the rest of my life." Me too.

I want to stay young forever. - standard & basic. Meaning that you want never want to get old. You can add a bit more "zing" (energy, enthusiasm, liveliness) by saying the following; I'm young at heart, I never want to be an old fart. - "young at heart" meaning, you may be not a child, you could be 40 years old but still feel like a kid. An "old fart" is an old person who keeps moaning all the time. I wanna stay in never-never land. - "never-never land" taken from Peter Pan. Never-never land is a place where you can stay young forever, especially when you're already a kid. "I wanna stay in never-never land & never become an old fart!" This phrase sounds a bit sad & upset by the fact of getting old.

Native speakers will say like this: “If I had the choice I'd stay a kid forever”. There are lots of other ways to say it, but this one is the most accurate and most commonly used. Here is an example on how to use this in a conversation: A: Are you looking forward to having your own place and a family? B: Not really. If I had the choice I'd stay a kid forever.

If you want to state that you do not wish to be an adult in a kind of sulky way, then you could start your sentence with the form: 'I wish...' This indicates that the situation is imaginary or unlikely to happen and is a way of expressing displeasure, regret or sadness for something that will never happen, or is extremely unlikely to happen. "I wish it would stop raining!"