Well done for reaching out. School can be really stressful, even when you enjoy it and are motivated to finish so it makes sense that you're having a particularly hard time right now. You've completed nearly 13 years of schooling and that's a massive achievement. You should be proud of yourself for that.
I know it's much easier said than done but you've only got 2 terms left and then you're finished. I think even if you don't want to go to University and aren't aiming for a certain ATAR you should still try to complete high school so you get your certificate. It makes it much easier for future jobs and if you choose to go to University later in life. Have you accessed any services at your school like counseling or tutoring? You should talk to a teacher or a principal and ask for any extra support you can get. They can help you better manage your time and get your work done when it's due or allow you extra time to complete tasks if you're under a lot of pressure.
I'm glad to hear that you still want to enjoy your last year of school. It's important to maintain a study/fun balance so you're allowing yourself to relax and do things you enjoy. Otherwise the stress can become too much and start having negative effects on your mental health.
All the best,