You are OK. Not everybody has a roadmap for their future at your age. I pretty much agree with your conclusions from working through different scenarios. Take

You are OK. Not everybody has a roadmap for their future at your age. I pretty much agree with your conclusions from working through different scenarios. Take a good look at the "esoteric" topics that interest you. Is there a common thread, e.g. bio-engineering? Think back at when you were young, what did you enjoy doing the most? What were your hobbies? When you step back and look at such questions and your answers you will see a common theme. That is the gist of the idea for where to direct your interests. Then based on those interests you will identify the area in which you might enjoy working. Over time your interests will change and it is perfectly Ok to change careers as you go along. If none of that jells, then consider taking a year off to work as a builders' laborer. The fresh air and physical work will clear your mind far better than sitting in some grad course lecture.