Your first point is a very old and well-analyzed one amongst Marxists, in the sense of time-as-labor, "time" being the usual approximate metric for the measure of labor. Indeed, depending on how one interprets your question, it may be that you independently stumbled upon one of the key points of Marxian analysis and the concept of surplus-value.
Perhaps with that qualification some Googling may serve as a productive use of your time.
Ach, I had not realized that required classes in college might feel as useless as required classes in high school.
But perhaps college classes will be more rigorous and less likely to induce I-Could-Learn-This-On-Wikpedia Syndrome. I can but hope.
Oh god, this is still an issue for people in college?
And here I was assuming that after I got out of high school I wouldn't think along these tempting-yet-ultimately-ruinous lines ever again.