Ego is the phrase that defines who evolves in poker. Not every hand needs to be played, and the most annoying fold is often the one that saves your
bankroll and your sanity.
The hardest hand for me (and for most grinders who convert) to give up is QQ (queens) — especially when created or 3-bet by a tight/aggressive reg.
Why does folding up with QQ hurt so much?
It's the third best starting hand — it seems "almost unbeatable".
Ego screamed: "I'm better than AK/AQ most of the time, folding is weak!".
But against a polarized range (AA/KK or heavy bluffs), QQ becomes a coin flip or worse. And when the villain 4-bets shoves or overbets the river, the heroic fold with an overpair hurts the soul.
Others that hit everyone's ego hard:
AK (especially suit) — "Dominator of everything!", but becomes dominated against AA/KK or a board that doesn't help.
JJ or TT deep stack — overpair on the flop, but sets and two pairs are destroyed.
Low set on a dry board vs. a nit that check-raises all-in — "My set is good, right?"... until seeing the straight or higher set.
Top pair top kicker (AK/AQ) on a scary river — station calls, but regular value heavy doesn't.