Your first semester is definitely too soon to tell. It could be down to your teachers. If you're an English major but you're not liking doing essays, that could very well be your teacher's fault, or else the fault of the class you have to take. Freshman level English classes suck. Actually, all freshman level classes suck. They're pretty much all boring, bullshitty things where there's enough work to be a pain in the ass but you can't take any of it seriously because it's so silly. So if it feels like a waste of your time... yeah, it absolutely is. But it's not going to continue to be that way.

I don't know if Ratemyprofessor does NZ profs or if there's an equivalent site for you guys, but try to find one and utilize it when you sign up for classes next semester. Look for professors with good reviews - though take all reviews with a grain of salt. Some people give professors bad reviews just because they got a bad grade and didn't pay attention. Take a sophomore level class with a respected professor before you decide.

In the meantime, do research on exactly how necessary a degree is for what you want to do. See if your university has any sort of career counseling services - if they do, utilize those fully. Look online. Try to find any sort of mentorship or job shadowing services where you could connect with people doing what you want to do. Use that opportunity not only to help you get an idea for what all the job entails, but to scope out how important education is for it. Do they have a degree? Do all their peers have degrees? Did their peers without degrees get to where they are based on the sheer force of their talent and it was a total fluke, or did their lack of a degree just not matter?

College sucks. Homework sucks. Many times a semester (or month... or week) I think "UGH I JUST DON'T WANT TO DO THIS ANYMORE." But beneath all the suckiness, I really do love to learn. So that's what you have to ask yourself. You hate the homework, the getting up early, the boring classes, whatever. But at the end of the day, do you feel like you're getting something out of this?

There really is no shame in deciding that university is just not right for you. It doesn't make you stupid or a failure or a quitter or whatever. It just means it's not right for you. But not having a degree is going to make good paying jobs rough to come by. If you go on to be a scriptwriter, that's fantastic. But there's going to be an interrim period where you're probably going to need to make more than someone who works in retail makes. You're going to need some experience in the field before people start hiring you. You've got to start at the bottom but, unfortunately, people generally don't let people into the bottom unless they have a degree.

Now, this is all based on US stuff, and I don't have specific knowledge of the scriptwriter's life. Your mileage may vary. But the decision to not get a degree can have a pretty negative impact on you, and it's not one that should made just because the first semester is hard or boring. Two and a half years really isn't that long of a time. I'm finishing my second year of college just now, and it feels sort of like I just started.