Hello Angus, we go through school, then uni or college expecting that we're doing this to please our parents and believing we hope we don't waste their money, but it's the parents duty to provide food, education, clothes etc for the benefit of their children in being able to develop a life of their own.
We all make decisions that perhaps our parents don't agree with, but we do this because we believe it's the way we should change our direction and don't want to do what they expect from us.
As a young kid they could take the family for a holiday, but you don't enjoy it, so is this wasting their money, the same may apply with the clothes they buy for us, which we don't wear, does the same apply here.
I'm sure my Dad wanted all his kids to be a doctor, none of us are, so did he waste his money sending us to an expensive private school, no, because it still gives us the opportunity to develop in our own way and what we all ended up doing made him proud of us, so if you are uncomfortable going to Tafe, then you have many other options to choose from.
Try not to let this create a problem for yourself and if I can say I've given money to my two sons to help them out over the years and I don't consider this as wasting my money, it's part of being a parent.
Please look after yourself and contact your doctor and hope you can get back to us.