[kroeliewoelie]

You could have played it differently. 3bet preflop, not mandatory but an option. You could have raised the flop, but calling is fine if you wanna play a bit more passive. But on the turn you got it in with the nuts, so that's ok.

Anyway, you seem somewhat passive and only getting active when you hit your hand. This makes you readable, which is of course of no concern at 2NL. But since you have never tried to use fold equity anywhere, I suppose you don;t use it a lot. That means you win less pots and maybe that's why losing a big one hurts more.