You asked a very interesting and important question. Here are some resources that might help.
Here is a list of the best STEM jobs
Here are very helpful sites that talk about STEM jobs:
If you are interested in engineering, here is a great site for you to visit:
Hi Morgan, If you like computer science/coding, I found attending the hands on workshops very helpful. For example the Summer Immersion program provided by Girls who Code. https://girlswhocodesm.smapply.io/ or local hackathons in your city : https://www.hackathon.com/. You will learn a lot by working with a team and come up with different solutions together. This will help preparing you to look for a job in the future.