There are Interest Inventories you can take over the internet, some for free, more advanced ones you pay for.

I would also think about why you dont have a goal. My answer is, my parents, in various ways and for various reasons, crushed my motivation every time i tried anything. Its hard to work towards a goal when you KNOW it will be snatched away from you.

It makes choosing a goal nearly impossible, and taking a step toward it very scary.