A career planning course can be very helpful with that. You could look into it at your school, read about the class and maybe ask someone who has taken it, then if you want to you can take the class.

Or you could try to figure it out without taking such a class. There are plenty of articles online that you can consult. For example:

5 Ways to Pick the Right College Major

Glad to hear you had a good first session with your trainer. I hope that works out well for you.