mid pair against flop raise,

[ANY2CARDZ]

Im trying to learn 6 max, this is very frustrating I know the play is horrible, but I cant seem to come out on top, ive only played 3500 hands, but im down (2bb)/100 hands, and I feel very lost.
This is one of those situations where in a full game I could this up in an instant, but here im not sure what the correct play is? I wanted to fold when he raised the flop, but figured I should get to show down.. What Do you do in this situation or similar situations? Thanks

Anyways villian is 40/10/2 over 50 hands.
Party Poker 1/2 Hold'em (6 max, 5 handed) FTR converter on zerodivide.cx

Preflop: Hero is UTG with J[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises</font>, MP calls, <font color="#666666">2 folds</font>.

Flop: (5.50 SB) K[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP raises</font>, Hero calls.

Turn: (4.75 BB) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP bets</font>, Hero calls.

River: (6.75 BB) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP bets</font>, Hero calls.

Final Pot: 8.75 BB