I've been trying to up my aggressiveness lately, but I seem to keep running into hands like this, where I lose big..

PokerStars No-Limit Hold'em, $0.10 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP3 ($9.85)
CO ($8.20)
Button ($10.85)
SB ($6.50)
BB ($10.10)
UTG ($10.90)
Hero ($11.05)
MP1 ($13.20)
MP2 ($4.05)

Preflop: Hero is UTG+1 with 6, 6.
UTG raises to $0.4, Hero calls $0.40, 2 folds, MP3 calls $0.40, 4 folds.

Flop: ($1.35) 2, 9, 9 (3 players)
UTG bets $0.5, Hero calls $0.50, MP3 folds.

Turn: ($2.35) 3 (2 players)
UTG bets $0.6, Hero raises to $1.8, UTG calls $1.20.

River: ($5.95) T (2 players)
UTG checks, Hero bets $3.5, UTG calls $3.50.

Final Pot: $12.95

PokerStars No-Limit Hold'em, $0.10 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Hero ($11.80)
SB ($7.45)
BB ($9.85)
UTG ($12.75)
UTG+1 ($2.90)
MP1 ($10)
MP2 ($11.05)
CO ($9.25)

Preflop: Hero is Button with K, Q.
5 folds, Hero raises to $0.4, SB calls $0.35, 1 fold.

Flop: ($0.90) 3, K, 4 (2 players)
SB checks, Hero bets $1, SB calls $1.

Turn: ($2.90) T (2 players)
SB checks, Hero bets $2.9, SB calls $2.90.

River: ($8.70) 3 (2 players)
SB checks, Hero checks.

Final Pot: $8.70

The second had I was just unlucky.. but should I have been betting less?
The first hand.. I put him on overcards, bad play? Was I wrong to attempt a steal here?