Congratulations on your previous fasts and graduating. Graduating college is a very exciting and sometimes distressing transition in life. As to your question about what the rest of us do during a fast...I can't speak for everyone but I think most of us live. For me, when I'm fasting I do everything I would do if I weren't fasting (except for maybe eat :) I go to school, work, out with friends, spending time with family, laying around watching tv, or reading a book.
It sounds like you're navigating that transition from school to work, which can be difficult and feeling lost is ok. I suggest you find something you are passionate about and explore it. Don't put your life on hold because you're fasting...besides how much extra time could you possible have by just cutting out mealtimes?