So many questions.
Graham's Laws are relatively simple once you realize they aren't too difficult to comprehend. I'd say more but you dissed science.
My reason for going into science was it was the thing to do. At the time of my SATs I indicated I was looking to study history and theology and at the time my career goals were simple enough. Either become a history teacher or a preacher. Since my history grades were never spectacular that knocked out the history side and I was in my falling out with religion at the time so the theology went bye-bye as well.
What to do, what to do? I realized I liked the sciences, all of them. Additionally I was good with them. Since I still wanted to educate young people, I stuck with the goal of becoming a teacher. A few short years later, I was teaching high school students in the wilds of Vermont. Okay, it wasn't that wild; although, some of the students were.
Science for me, is a constant learning experience, beyond the textbooks. When teaching there was the continual look of awe, wonder, amazement as students learned. Teaching, finding a way to reach a student was part of the happiness which I received. Eventually, I decided it was time to retire. I ended the time there and got to the next chapter of life. There have been a few chapters added on and hopefully several more are ahead.
My financial matters I keep fairly private.
As to your dietary, eat properly. When it comes to tacos, have you reached a point of trying to assemble some on your own? Probably a little healthier than the Taco Bell might offer. At any rate, your father knows best on this, so heed his advice.