Do you remember what changed when you turned 18? Compared to 17, it was a big change? I am close to 18 and I see some friend with 19, 22 living the same way they lived with 17, vagabond
I am 17, I don't work and what I "study" can't provide me a job
Well, although it might not seem different, it actually is! Being 18 allows you to have a legal job so you can earn some money by your own. At the end of the day, having your own job will give you the skills and personal development to become an adult.. or at least that is what most of the people tend to grow up like this.
you feel happier you're an adult but there's more burden and responsibilities than a kid rent, food, taxes, laundry is a lot of effort. making choices is something you might not get used to at first but hang in there.