KQs tp facing psb on turn against aggr player (6 max)

[Dommer]

Villain is 55/18/3.5 after 108 hands, w@sd 50%, wtsd 20%, but I think at the time I didn't have quite that many hands on him. All I had to go on was that he was calling all my pfrs and was min raising my continuation bets often. I had folded to most of these min raises as I had missed the flop. He was also making large stabs (like 5$ into a 2$ pot) at uncontested pots and taking most of them down. The turn decision was a little tough for me as I hadn't seen his turn action nor had I seen him showing down any hands. But it was clear that he was contesting a lot of pots with probably crap hands and was very aggressive. But all I got to see was him taking the pots down on the flop etc. Does this sound like enough evidence to go for it on the turn, or is my fold ok? I'm new at 6 max so I know a hand like tp is a lot stronger than at full ring, but I've been getting into trouble with it. If you think my pre-flop play was bad as well let me know.

Party Poker No-Limit Hold'em, $ BB (6 max, 6 handed) FTR converter on zerodivide.cx

Button ($113.05)
SB ($37)
BB ($33.70)
Hero ($99.20)
MP ($86.13)
CO ($407.90)

Preflop: Hero is UTG with K[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/club.gif[/img]. SB posts a blind of $0.50.
<font color="#CC3333">Hero raises to $3</font>, <font color="#666666">1 fold</font>, CO calls $3, Button calls $3, <font color="#666666">2 folds</font>.

Flop: ($10.50) 3[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $8</font>, <font color="#CC3333">CO raises to $16</font>, Button folds, Hero calls $8.

Turn: ($42.50) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets $40</font>, Hero folds.

Final Pot: $82.50

Results in white below: <font color="#FFFFFF">
No showdown. CO wins $82.50. </font>