Nothing in High School had any real effect on me. It was being in the military that changed my life.
Same here, but I have to give the credit of being encouraged to join the military to Mr. Parker, my HS guidance counselor. My Senior year, he would do interviews with all the people graduating that year, help them figure out what schools to go to, as well as helped them with their applications.
When he interviewed me, he asked what college I was planning to attend. I told him that because my Grandparents didn't have enough money, chances are I wouldn't go and would start working right after I graduated. He then asked me what kinds of things I was interested in, and travel was in the top 3. He said that if I was interested, I should check out what the various services had to offer, as they went all over the world and I might get a chance to see a foreign country.
Best damn decision I ever made. Not only did I end up with a career that I am proud of, as well as got some pretty interesting assignments (2 back to back tours of Independent Duty my last 2 stations. One on an MSC vessel, the second one was in recruiting as Head Classifier and LPO of Amarillo MEPS), but I ended up staying in for over 20 years and now have a decent retirement and health care for the rest of my life. Been to 26 different countries and 49 different states, only missing Alaska.
As far as who was the most influential on my service in the Navy? That's easy, PN1 Bayona who was my first LPO. He would regularly throw out questions for the office to answer, and whoever got it right was given a soda or a candy bar. Taught me early on to pay attention to the regs, especially the new ones that came out quarterly with the manual changes. And, he also taught me that if I did the manual changes, I would be the first "in the know" of the newest rules. He taught me well as to how to do my job, and also instilled in me a love of being a PN.