Your high school or college probably has career counselors you can talk to. You can also talk to a job placement firm or maybe your area has a government jobs office you can go to to take an aptitude test.
Then of course there's go in and try it out and see if you like it.
Ideally, you want to get a job that takes your strengths and uses them, with career opportunities, and is at least mildly interesting.
Here's one website that I did using a Google search. You may want to do more Googling
★☞ What Job Is Right For Me? Quiz Career suitability test profession trade employment occupation choices