WTF to do?????

[Capitan23]

Full Tilt Poker - No Limit Hold'em Cash Game - $0.10/$0.25 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $14.70
Hero (BB): $26.55
UTG: $31.10
MP: $39.45
CO: $25.35
BTN: $25.80

Preflop: Hero is dealt 9[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] (6 Players)
3 folds, <font color="red">BTN raises to $0.85</font>, SB folds, Hero calls $0.60

Flop: ($1.80) 6[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $1.00</font>, <font color="red">BTN raises to $4.00</font>, Hero??

Been playin with villian for 30 hands, over that time hes 28/21. Hasn't been involved in any noteworthy plays, still pretty much unknown.

I'm leaning towards fold here, but I don't know what to do.
Im toast to an overpair or set, pretty even money against hands like A8 with 1 over and straight draw, behind to good combo draws