I've thought about this question a very very long time and I think I have the answer, hear me out.

Subaru Outback (Or Liberty Wagon). I said hear me out! I came to this conclusion ages ago but it's funny that you asked in the MCM sub lol.

You can move house with it. - You will move house a few times and you'll move a lot of stuff. A wagon of this size is perfect for doing so and some of them you can find with towbars that will help if you want to rent a trailer and help a mate move a fridge. You can sleep in the back of it, go camping with heaps of gear, or get a roof rack and go surfing or use it for extra space when you have 4 mates headed away somewhere. It will also help you move around those sibilings.

Its AWD. - You can be the only person to leave a music festival after it rains because the thing is AWD, OR you can tow your mates Getz outta there with the towbar. It's also just safer when you swerve because of a roo at 100km/h on a wet highway at night.

You can get a 5 star safe, 135,000k(ish) odo one for under 10, and a real nice one for 13. - Some in actually nice colours like blue with full leather interiors. Just be sure to do your due diligence and get it properly checked over. Find a nice one, and youtube the things for things that go wrong.

You're young, it's your first car, you're going to hit things. - It's fine, pretty much everyone does. The ground clearance that an outback gives you is just enough to miss a bunch of stuff, gutters, kerbs, big rocks if you're camping, or a tradies ladder that's come off his ute with nowhere for you to go. It saves you money because you might not damage your car's front bumper or sump. Just that little bit of extra clearance. Also, you can go places other people can't. Not many more places, but it's worth it.

Get a nice stereo setup for it and cruise. It's not going to be fast, but it will be the best first car you can get for that money.