Sorry to hear that. If you strongly believe that university is not for you, then I think that discontinuing your studies would be a rational option, as it would allow you to relieve the pressure that is currently on you, instead of a potentially futile attempt to address unfavourable performance, which would only serve to keep that pressure, not to mention that you have now incurred the costs of the units that you are taking since census date has passed, regardless of your results in your units.
An alternative option would be to temporarily suspend your university studies instead of discontinuing them. This would allow you to take a break from university for a semester (or longer), during which you can reconsider your options, without potentially rushing into discontinuing your studies. However, this is only if you still have hope that you can turn things around in your favour.
If you end up deciding to leave university, there are other options through which you can still receive an education and start a career in a field that you are interested in. While university is typically one of the better options, it is not always the only option. Based on this, you may wish to enrol in a TAFE course (such as a certificate or a diploma) that is relevant to your university studies or that you might be interested in. TAFE courses are generally less demanding than degrees, providing you with an opportunity to manage your time and studies more effectively, and ultimately gain a formal qualification. Coincidentally, I was having a conversation with my colleague yesterday about his education and career. He is in a similar situation, having previously been enrolled in a Bachelor of Arts but later discontinuing his degree due to being unable to cope with university. He has instead decided to pursue a TAFE qualification with the aim of properly preparing himself for university studies.
I hope this helps!