There are a wide variety of tests and books out there to help you identify things you are suited for. You could use those as a starting point, and then consider each one.

Back when I took all those tests, it was via seminars, appointments. But I think today most are on line.

Here is one, based on Myers -Briggs personality type:
http://www.careertest.net/

Google career test for a load of hits.

Books that were popular "back when" included
What Color is Your Parachute? (I loved this one!)
Do What You Love, the Money will Follow

I knew I wanted to be a lawyer from 4th grade. The teacher asked all of us one day, and got the usual: girls said teacher or nurse, boys said Indian chief, fire chief, and cowboy. And then there was me, said lawyer. Next PTA meeting, teacher told my folks, "I hope you've started a college fund for this girl."

I never considered anything else. That was my goal all along.

Then I found I hated the work. Hence, started taking the tests I've mentioned above. Yuppers, law is NOT what I am cut out for!