Stay crispy lettuces is not enough? 15 is a time of professional grade boredom. Why should your mom change her life when you will soon change your mind. I advise against going off alone, there are people, not a good idea. Ebay Austrialia will deliver used games to your door.
15 is a good time to be 15. It is a transition between 14 and 16. I do not understand the no school, but no learning is wrong, there are books. You do write, getting anywhere takes basic math, computers are magic boxes filled with parts that have functions.
Unless there is a Degree in Aussie slang, you will have to learn a few things to get in. As you are already totally bored, it can get no worse.
I think you write well and express yourself well. There is nothing to do but build on your interests.
You draw well, art is good, writing is good, it moves things from inside you head to outside. That is about all humans do.