A few hands

Alright...tell me how much I suck at poker...

Hand 1:
$0.25/$0.5 No Limit Holdem
6 players
Converted at weaktight.com

Stacks:
UTG ($9.50)
UTG+1 ($140.65)
CO ($50.45)
Hero ($68.10)
SB ($49.75)
BB ($56.05)

Pre-flop: ($0.75, 6 players) Hero is BTN :kd: :kh:
UTG calls $0.5, UTG+1 calls $0.5, 1 fold, Hero raises to $3, 2 folds, UTG calls $2.5, UTG+1 raises to $12.75, Hero calls $9.75, UTG folds

Flop: :6s: :2c: :tc: ($29.25, 2 players)
UTG+1 bets $29.25, Hero goes all-in $55.35, UTG+1 calls $26.1

Turn: :9h: ($139.95, 2 players)

River: :4h: ($139.95, 2 players)
Hero says "ouch"

Final Pot: $139.95
UTG+1 shows: :as: :ah:
Hero shows: :kd: :kh:

UTG+1 wins $136.95 ( won +$68.85 )
UTG lost -$3.00
Hero lost -$68.10

The second I got limp raised, I knew something was up. Should I ever fold this?

Hand 2:
$0.25/$0.5 No Limit Holdem
5 players
Converted at weaktight.com

Stacks:
UTG ($31.65)
CO ($44.25)
BTN ($110.20)
SB ($86.15)
Hero ($71.35)

Pre-flop: ($0.75, 5 players) Hero is BB :6c: :ac:
1 fold, CO calls $0.5, 1 fold, SB raises to $2, Hero calls $1.5, CO folds

Flop: :tc: :ah: :8s: ($4.5, 2 players)
SB bets $3.5, Hero calls $3.5

Turn: :5c: ($11.5, 2 players)
SB bets $9, Hero calls $9

River: :2c: ($29.5, 2 players)
SB bets $22, Hero goes all-in $56.85, SB calls $34.85

Final Pot: $143.20
Hero shows: :6c: :ac:
SB shows: :th: :as:

Hero wins $140.2 ( won +$68.85 )
CO lost -$0.50
SB lost -$71.35

Was it unintelligent of me to play my hand this way? I figured he had TPTK, and that my outs from the 6s were good. My question is if I knew he had 2pair would this still be a call or a fold on the turn?

Hand 3: Wow...okay. This was played...terribly. Uh...suggestions? Just fold river? Looking back on it I couldn't see him doing this with worse then AK.

$0.25/$0.5 No Limit Holdem
6 players
Converted at weaktight.com

Stacks:
UTG ($54.10)
UTG+1 ($51.55)
CO ($21.55)
Hero ($72.55)
SB ($110.00)
BB ($53.10)

Pre-flop: ($0.75, 6 players) Hero is BTN :ah: :th:
UTG raises to $1.75, 2 folds, Hero calls $1.75, 2 folds

Flop: :2h: :js: :ac: ($4.25, 2 players)
UTG bets $3, Hero calls $3

Turn: :qd: ($10.25, 2 players)
UTG bets $7, Hero calls $7

River: :8c: ($24.25, 2 players)
UTG bets $19, Hero calls $19

Final Pot: $62.25
UTG shows: :jc: :jd:
Hero shows: :ah: :th:

UTG wins $59.25 ( won +$28.5 )
Hero lost -$30.75

Hand #1: Perfect.
Hand #2: Perfect.
Hand #3: Fold turn.

Really? In hand one what would you do if you were holding say JJs? I mean, is it really any difference what Overpair you have? Are all people forced to stack?

jacks is merely a bluff catcher so its a bit different.