Tangentially related to your question, Ed from Low Level has really good reverse engineering content that might pique your interest as well as a series of developer courses.
I'm this person and I often get misunderstood. I can be the center of a room and I'm loud not quiet. People attribute this with being an extrovert. I am absolutely not, I am an introvert. It's draining for me to be front and center but I don't mind doing it. I recharge by being alone. I have to explain this to folks often.
In my mind, it's a best of both worlds being able to do both. But the introvert/extrovert is about how you gain energy, not whether you are shy or center of attention.
The short answer is no, undocumented immigrants can't join the US military.
Quoting from the US Army recruiter FAQ:
Can non-U.S. citizens join the Army?
Enlistment into any branch of the U.S. military, by citizens of countries other than the United States is limited to those foreign nationals who are legally residing in the United States and possess a Bureau of Citizenship and Immigration Services Alien Registration Card (INS Form I-151/551 - commonly known as a "Green Card"). Applicants must be between 17 and 35; meet the mental, moral, and physical standards for enlistment; and must speak, read and write English fluently.
My wife bought me ADHD is Awesome by Kim and Penn Holderness. It does a good job of describing how Penn's brain works differently and how he and his wife have learned to accommodate it successfully.
Side note, it's tough for me to sit down and read so I'm slowly making my way through it to learn how to best manage myself. But from what I've read so far, I've had many AHA moments I've shared with my family or "this is me!"
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That he published after he was no longer serving as the Chairman of the Joint Chief's of Staff. The US military is known for being apolitical. This is him speaking out as former CJCS Mark Milley, and not CJCS GEN Milley.
Another ls alias I'm a fan of is ls -latr which I alias to lt. It gives you a time sorted directory listing with the most recent next to your cursor (helpful for large directories).
Not exactly what you're asking for, but I've learned a lot about agriculture from Farming Simulator. It's neat driving around and understanding what the farmers are doing in their fields.
Tangentially related to your question, Ed from Low Level has really good reverse engineering content that might pique your interest as well as a series of developer courses.