I love what the others have posted and I will add my own spin to it.
I have been working (before and after college) for for 13 years now. I have had seven different types of jobs in that time. Mostly, that was because I gave myself permission to explore until I found something that I really loved to do. The job I have now is my dream job but I would never have thought I'd be doing what I am doing now (strategy & operations for a tech company). Based on my own experience, I recommend you explore a bit, if you feel you have the flexibility in your life to do that.
I would start by writing down all the things you're interested in. People? Computers? Travel? Food? Math? Science? Physical activity? It can be anything! Just start the list as a way to get clear on what you might want to explore first. Once you've got your list, you can start looking for people with job in a field related to your interests.
I love the recommendation you got to meet with people who have careers you think you'd be interested in. These are called "informational interviews". Often, if you send an email or Linkedin message to a person you'd like to learn from, they will agree to meet with you for about 30 minutes over coffee (always offer to buy the coffee, if you can afford it). You can also ask adults in your life about their career paths. Do you have someone at home or at school who might be doing something you're interested in? Talk to them as a low-pressure way to get started.
Once you have an informational interview scheduled with someone, go to the meeting ready to ask questions and always end the meeting by asking if that person has any recommended next steps for you or has other people they think you should meet with. Here is an article about how to conduct a good informational interview: https://www.themuse.com/advice/3-steps-to-a-perfect-informational-interview
Best of luck! Be willing to explore and know you won't always get it right the first time (I certainly didn't).
Simone recommends the following next steps:
- Set up a Linkedin profile so you can connect with people in fields you're interested in: https://www.linkedin.com/pulse/linkedin-tips-high-school-students-judy-schramm/
- Explore your interests: https://bigfuture.collegeboard.org/get-started/know-yourself/5-ways-to-find-career-ideas
- Reach out for informational interviews: https://www.themuse.com/advice/how-to-ask-for-an-informational-interview-and-get-a-yes