I have know idea what to do for a career? Please help!?

Here is my dilemma, in English we are making a portfolio and a decent amount of it requires your goals in life/ career. My problem is that I don't know what I want to do. Originally I wanted to be a marine biologist but for different reasons I decided I wouldn't want to do that. Recently I wanted to be forensic scientist of some sort but once again I decided against it. So I wanted to know if anyone knows a good free career test, because most career test you have to pay for the full report. Or if anyone knows tips for finding a career. P.S. I am a freshman in highschool