I thought this would be simple, but some years were a mixed-bag, so my impulse best-of choices aren't as clear-cut as they appear.
But without overthinking it.
* Pre-college: Eighth grade. A sweet-spot position, sort of king-of-the-hill grade, prior to high school, did well in all sports, good year academically, felt confident socially and among peers.
At ISU:
* Spring semester, sophomore year. Manageable class load (and did well GPA-wise), beginning to get exposed to a lot of new music.
* Spring semester, senior year (I didn't graduate until fall -- 4 1/2 year student) ... was close enough to full credits for my major, and had a couple of "punt" classes that were either complete the core requirements or they were electives. Personal life was good; had gotten the only single-unit on our dorm floor (secured it through a random draw among five of us with residence hall "seniority.") That semester that brings me the strongest college nostalgia.