NL 50 FR: 66 in a situation I play alot and think I suck at

[crazymoose]

Only have 8 or so hands on villain.

I have $40, villain covers.

I have 66 in MP. One limper to me, I call, button raises to $4 and I call. (First mistake?)

Flop is 5 7 T with a heart draw.

I check, villain bets $4, I call. (Second mistake?)

Turn is an offsuite 9. I check, villain bets $10, and I....?

I get in situations like this all the time where I have a small pair and it sucks. Stop playing little pairs OOP? Or force villain to better define his hand?