Aw, that has to be rough. I sympathize
But let me share some advice, from one imaginative person to another:
You don't know whether a lot of the things (listed below) that you fear are true or not. You won't know until you talk to the Uni people.
Because you have an active and fertile mind, you can think of all sorts of alternatives -- and because you're a sensitive soul and this is something you worry about, you can picture every alternative turning out badly. But just by random distribution, I don't think it's likely that
every unopened envelope has bad news in it.
Can you just tell yourself to put those worries in a lockbox for the next 18 hours (or whatever), until it's time to take them out?
Or would it help you to jot down some if/then proposals, so that if an official (picture
the pimply guy in Mora) tells you no, you cleverly have thought out a Plan B, and then a Plan C, D, etc.?
As far as practicalities, obviously I have no idea how the University of Tasmania works. But:
* You clearly don't suck at drawing -- I've seen (and enjoyed) your work. Even if it turns out you're not the next Picasso, so what? Drawing is a good thing to know about in a lot of design-type fields.
* Same thing with painting. Who knows, you could have an Emil-type epiphany and discover your life's passion working with gouache, oil, or [knowledge of types of paint runs out]. Or you could just have fun with it. I was always glad I took music classes in high school (playing flute in the band). I was never very good (partly because I never practiced enough). But music has enriched every day of my life since.
I can imagine how difficult it is to have your dad also be your boss, especially when the family business is farming, as opposed to something with 9-to-5 hours where it's clear when you're "on duty" or not. But maybe we can return to this issue BECAUSE...
"Downton Abbey" is about to start! Gotta rush... I have to find out what sassy quips the Dowager Countess is making this time!
Good luck!
Sunflower
Awaaaaah, I'm one unit short for my classes this coming semester, because the unit I wanted to do is only available next semester (Ancient History) and now there's a gap and I don't know if I have to chose an advanced unit to replace it or nottttttt. The only other advanced unit I know I've got the prerequisites for would be French...and...I can never take that class again O___O never.
I'm sure all the other English units are full up (and it might be a headache doing an advanced English major and minor) and the practical art courses were (understandably) really snooty when I tried to sign up late last year (when my degree was rearranged just as classes started) and I just... I'm a bit scared they're going to be snooty again. And I might suck at drawing. I know that painting would be a bad idea, because I have no experience in that medium- except house painting 
Maybe I should see if there is another graphic design unit that would compliment my design major...hmmmm...uhhhh *facepalm*
I think I'll need to visit the Uni's student centre and get it sorted out in the city :/ I was planning to go to town today, but had to cancel all my rarely-made social and shopping plans so I could check the tree irrigation on the home block today for dad....But that has not happened!? I've been sitting around the house in my work clothes, ready to go all day...and I've never gotten any indication that the water was going and ready to be checked (I'm not allowed to turn it on) or that this was a thing happening today...so this was a day wasted essentially 
aggggggghhhhhhhhh why can't I have a real boss with a schedule and contactability and and and ughggggghhhhh. Was I supposed to call him up in the middle of his meeting and tell him to turn it on and drop off my equipment from the other farm? I don't even know. I don't even know. I can't even quit because it's NoT a REaL JOB! *mutates into a troll*
[/rant]
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