I'm so lost. 6-max hand

[hemstock]

First of all 6max is hard. I still cant understand when to fold, or call down with middle pair. Half of the times players keep doking you with small pocket pairs and the other times they really have top pairs. Also loose and passive fish, dont raise their premium hands like AQ, AK all the time and I end up losing a lot of money heads up mostly. Another thing. It's folded to me in the button on a full ring game and I have a hand lik J9o or so and I raise. I am getting reraised 80% of the time when I try this shorthanded.
Villain is a loose and semipassive postflop
I have a small flush draw on the turn so I decide to call it since it might be good HU. The pot is big on the river so I make a crying call.

Party Poker 1/2 Hold'em (6 max, 6 handed) FTR converter on zerodivide.cx

Preflop: Hero is UTG with 7[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/diamond.gif[/img].
<font color="#CC3333">Hero raises</font>, MP calls, <font color="#666666">3 folds</font>, BB calls.

Flop: (6.50 SB) 5[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">Hero bets</font>, MP calls, BB folds.

Turn: (4.25 BB) 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP raises</font>, Hero calls.

River: (8.25 BB) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP bets</font>, Hero calls.

Final Pot: 10.25 BB