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You need to really think about what you are good at and what you enjoy doing, such as any hobbies. One way to do this is to brainstorm. You can either think of things in your head or write them down, which in my opinion is more effective. Brainstorming is putting ideas that come to mind down on paper, so you can also visualize them. So, start there by writing down the things you are good at and enjoy doing. Then, circle your absolute favorite things from that list and at that time, you should realize what it is you may want to be in life.
Are you currently in High School or College? If you are in High School, I would say make sure you finish that first, because it's really hard out here to get a good job without at least a High School Diploma. Then, if you plan on going to College, I would major as "Undecided" at first, until you really figure out what it is you want to do. But, by then, you should already have an idea, so your decision should not be very difficult.