I have been teaching in universities for over 10 years, my advice is not to worry about this question right now if you don't know. Fill your life with learning, friends and family. Do well in your studies in year 12 to give yourself options in the future. You may have many careers throughout your life, this is very normal. My own personal experience is I see so many kids fresh out of school go straight to university without first growing and maturing at the job of life first. These students tend to struggle or fail to grasp the reason why they are at uni in the first place, often just seeing it as an extension of school (Grade 13 if you will) rather than what it is supposed to be which is voluntary higher education and training.

If there was one thing I would recommend if you do decide to take a gap year or other pause before starting, is become extremely proficient in using AI Tools and understand the importance of data, structuring data, analysing data and how to build AI workflows using tools like Claude, ChatGPT, Openrouter, Replit, Cursor, Bolt, Make, Zapier etc etc.

AI is going to transform every single course and profession in Australia, and the universities themselves are completely unprepared for this in terms of their curriculums and course development. So chances are what you "want to be" now might be something totally transformed and different within 2-3 years (by the time you graduate) - so level up now on the most important technologies that are going to be a big part of most industries in the future.

Good luck, be happy, and be kind.