I'm terrified of becoming an adult

(Originally a blog but I wanted to post it here)

I know damn well I'm not mature enough to be one and I don't know how I'm supposed to prepare for adulthood. I turn 17 in less than 3 months, and that's going to be the last year of being a teen. I wish I got some advice on how to prepare for adulthood, because once I finish sixth form, I'll be on my own and fully independent. 

The worst part is that some people expect you to automatically mature the second you hit 18, that's unrealistic! I don't know how I'm supposed to become "mature" as the same people just constantly undermine me for being a teen. It would help if I got advice for becoming an adult, but all I get is "focus on school" or "enjoy your teen years" instead of actual help and guidance.

As much as I am excited about having my own freedom and independence, I'm scared. I know that I would have to get a career (hopefully something to do with writing), get my own home and (potentially) find a partner. To any adult who's reading this, what advice do you have for anyone who's close to becoming 18?

I'm sorry for posting this shitty rant, but I have no idea how I would survive as an adult.

I can't really relato to this one because even though it can seem scary to become an adult especially when you get "to be all by yourself". (*^▽^*) People can say whatever they want but you don't actually have to fit the standards of society. Being an adult is fun, it's the exeptations of some people that can create a certain pressure on others. But you'll be independent, wich means that you can choose to fit these standards or not.

People have their own way of seeing success/happiness anyways, so it's yours to decide if you want to grow up and keep that inner child inside of you.

I'm probably just yapping about nonsense since I am also just a lost teen trying to find herself but that's my point of view and that's how I was raised so I'm sharing my opinion about this.