The last time in my life I had a core group of classmates from a relatively similar geographical background.
Friends from my school came from NW Indiana, south suburbs and south side of Chicago. Now in college they come from California, Virginia, Nigeria, Bangladesh, India, Pakistan, Jamaica, Nepal. Sure we all have common interests, and I actually prefer my friend group now, but there are certain colloquialisms, jokes, and common regional references that are lost on people now.
Last time I actually had enjoyable history classes.
Feeling like I was making a difference in my school landscape (key player in making Science Olympiad team, political forum, key member of stage technicians and NHS treasurer).
Now, I sort of feel uninvolved in the wider school landscape. My involvement in campus activities varies but isn't as deep in any individual location (barring endangered snail research I do) Whereas I was known by a good portion of my high school on any given year, now, not too sure.
A part of me misses going home after school knowing that administration wasn't radically messing up something in my financial or educational or living situation. I love HU but...
Fighting against the man. My high school had a racist incident, and if it wasn't for me bringing pictures of it to life, they literally would have scrubbed away the evidence without mentioning it. It felt good making an impact, although to be fair I've done that at my unit as well.
Just the random hilarious moments like two guys splitting a watermelon in half with 100 rubber bands or people fainting during an assembly because they were kept in there too long.
Ending in the top ten of my class, because there's no way I'll make it there again in my life.