Ezra, to become an engineer it starts with a passion for math and physical science. In high school, take classes at the highest level of classes available for both. If there are classes in robotics or programming, these are also useful. Look for hobbies or extra curricular activities that allow you to explore these areas.
Engineering is very broad, so selecting the discipline to nice, but not required. If you, your counselor, parent, or friends parents know any engineers, set up some time to talk with them about what they do and why they like it.
Glenn S. recommends the following next steps:
To become an engineer first narrow down which discipline you'd be interested in. Here is a website that gives overview of the different types. Read through them and decide which sounds most interesting to you and your specific strengths.
From there it will be beneficial to attend a college that has a strong and well ranked program for that specific major of engineering. USNews.com is a trusted resource for researching information about potential colleges that you'd want to attend. The link below if for example and shows the best overall Engineering programs. You can also specify by major to see which programs are the best.
Once you pick a specific field, a few schools that you want to apply to, then go to each college's official website and look for their Students section to learn more about the school, program, application process, etc. Work hard to build up your grades, test scores, and resume so that any college and job would be eager to have you.