The last step to becoming a STEM professional happens after high school. Students who successfully complete a pre-college course of study can find excellent STEM degree programs at Purdue University, Indiana University, Ball State University, Rose-Hulman, Notre Dame, and many other colleges and universities. Such a four-year pathway can lead to an interesting and challenging career that will likely be rewarding for many, many years.
Shorter paths to becoming a STEM professional are also available. Schools such as Ivy Tech and Valparaiso offer two year degrees in computers, engineering technology, health technology, and manufacturing technology with opportunities for internships.
Finally, one-year programs, certifications and apprenticeships are available in construction and skilled trades, information systems, and health care. Contact your high school counselor, your local community college, or building trade group for details.
Here is a resource for free, online computer science courses https://www.computerscience.org/resources/online-courses/
Here is another resource to get coursework in the growing field of data analytics: https://bootcamp.berkeley.edu/data/
For students interested in the growing field of data science, these are good resources: https://www.mastersindatascience.org/