I have never considered teaching, and nor have I ever wanted to. But, I will say, if you're not feeling it anymore with your course, then don't push yourself any more into doing it; you'll resent it and your brain will use it against you. You already seem really burnt out by the course, and people can't push through burn out without a break.

Drop out or defer (if you can), and take a mental health break, go for more walks (if you can), get in touch with your hobbies and interests, friends even or a club. Then, look through the list of gov funded/free TAFE courses and see if any pique your interest. If you like building relationships with and helping young people, you could look into youth services courses instead. But don't get ahead of yourself, look after your present self.

Also,

Said by someone who tried to push through burn out in a call centre and ended up in the ER twice. Also a partner to someone who tried to do the same.

I am ready to become even more of a piece of scum in society as I don't have anything valuable to offer.

Nope nah no way. This line of thought isn't going to help you, I promise. You DO have something valuable to offer to society, because you are human; this particular job just doesn't align with you in the way you thought and THAT'S OKAY!!! It is so okay, it is normal. You wouldn't be a scum of society by getting on centrestink or anything, you just need a break to figure out what does align to your values!