if there are no clear passions, then be open minded and try many things. Volunteer, learn and be as open minded as possible. Keep a journal with 3 tabs - what do you like doing, what do you not like doing, what energizes you. For example, I loved being team leader and bringing people together for events etc. I did not like spending too much time on excel spreadsheets. I liked the coordinating work behind the scenes. I found out that I was a good presenter, but I was quite comfortable to stay behind the scenes and work out the details. This process of getting to know myself enabled me to decide what I will be when I grow up.
I did a Masters in Information Systems. I joined a company as a programmer...found out pretty quickly that I did not like coding and debugging, but actually enjoyed the business analysis part. So I switched to become a business analyst. From there, I became a project manager, program manager and team leader in strategy, planning and business operations.
Take the time to explore different opportunities, talk to a lot of people about what they do for a living and what they like about it. Read a lot about different careers and see what energizes you.
Remember that life is a journey. You own this journey and can change course at any time. The journey does not have to be linear.
With every good wish.