Down 13 buy ins in 24h/1,600 hands - probs not just bad beats. What leaks are in these spots?

Please be brutally honest. I think I have a decent idea what I did wrong but I would appreciate feedback too.

Pacific Poker - $0.25 NL FAST (6 max) - Holdem - 5 players
Hand converted by PokerTracker 4

BTN: 184.52 BB
SB: 120.32 BB
Hero (BB): 182.84 BB
UTG: 575.84 BB
CO: 310.84 BB

SB posts SB 0.4 BB, Hero posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has 9♠ 9♣

fold, CO raises to 3 BB, fold, fold, Hero raises to 13.2 BB, CO calls 10.2 BB

Flop: (26.8 BB, 2 players) T♣ 3♣ K♣
Hero checks, CO bets 8.84 BB, Hero raises to 33.6 BB, CO calls 24.76 BB

Turn: (94 BB, 2 players) 7♦
Hero checks, CO checks

River: (94 BB, 2 players) 8♥
Hero checks, CO bets 62.04 BB, Hero calls 62.04 BB

CO shows K♠ A♣ (One Pair, Kings)
(Pre 45%, Flop 93%, Turn 95%)
Hero shows 9♠ 9♣ (One Pair, Nines)
(Pre 55%, Flop 7%, Turn 5%)
CO wins 207.16 BB