how did you decide what to study?

em
I'm feeling really overwhelmed at the minute. I'm not going to do any tertiary education until 2018, but I feel that I need to get my shit together now and figure out a plan for myself.
Looking at all my choices I feel really overwhelmed. For a long time I wanted to be a lawyer, and I did work experience in a firm and got really bored. Taking my experience and my mental health into account, it's not a good idea for me. I've also looked at an apprenticeship in jewellery manufacture, but I worry that I'm not cut out for a trade.
I have a huge fear of failing, and I tend to give up as soon as my grades start to suffer. I'm worried about not enjoying a course, failing and having it be a huge waste of time and money. I don't even know what I'm interested in. I almost cry everytime I think about it. 😩
*EDIT*
For those in Australia: I'm wanting to go to TAFE. I didn't do WACE, therefore no ATAR, and I'm not really interested in uni, even so, I'd have to do a TAFE entry.