Have you ever taken a professional exam? They often ask you a lot about what you are good at and what you want to do to help you figure out what career you could do for the rest of your life. Do you know what you want to do for the rest of your life? Some have known that they were little what they wanted to be when they grew up, some realize only later in middle school or college and others still not sure about graduating from college.
It's not necessary to decide your career while you are in high school. Some college students think they should know them when they choose something that might sound good, do it at college, do not finish it or want to do it. It means almost an entire college degree down drain. If you wanted to change large heights, you could at least not have to recover the core courses, but it would still be wasted about 2 years or more.
What can you do while you are in high school to prepare your future career? As far as your career goes, it is best to do a university to explore. For example, if you are interested in science, you can explore different scientific cultures. Talk to your teacher and mentor about possible pathways in science. If you decide to be interested in medicine, look for people in medicine you know and ask questions. Ask if you can shadow them in practice to see how you like it. If you find that it is not for you, you do not have to worry about having a waste of time. You looked at it, figured out that you do not like, and now you can continue.
If you are not sure where to start, think about what you want to do. Are you artistic? Are you sent? Are you good at math, science or English? I like to work with people? Do you like children? Do you want to make a lot of money? Do you want to work a lot of hours? Do you want to do something flexible? Will you ever start a family? All this should be taken into account when you begin to review your career. If you take a job with a 70-hour-week commitment, you might find it contrary to the family you want. Look at everything for ideas and for reasons to do or not to do something.