Sounds like we graduated in similar times, though I suspect you are a little younger than I. Class of '77 here, graduated 3rd quartile, barely made it, and hated every minute of high school except when I was cutting class. :) Too many kids there!!
Did a little better in College some 22 years later, Summa Cum Laude class of '99. Something happens when you age, or at least it did for me.