Nl25, standard laydown?

[Baintz]

PokerStars No-Limit Hold'em, $0.25 BB (4 handed) internettexasholdem.com (http://www.internettexasholdem.com)

SB ($43.70)
Hero ($24.90)
UTG ($6.65)
Button ($20.50)

Preflop: Hero is BB with Q/images/graemlins/spade.gif, Q/images/graemlins/diamond.gif.
<font color="#666666">2 folds</font>, <font color="#CC3333">SB raises to $1.5</font>, <font color="#CC3333">Hero raises to $4</font>, SB calls $2.50.

Flop: ($8) 8/images/graemlins/heart.gif, J/images/graemlins/club.gif, 7/images/graemlins/diamond.gif <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $5</font>, <font color="#CC3333">SB raises to $21</font>, Hero folds.

Final Pot: $34

Apologies if this is a standard fold, I just can't see what I'm beating here, I'm pretty new to cash play after learning my trade in SnG's and MTTS. Never realised how much more interesting cash play is.

No reads on villain as this is about my 5th hand at table.

[wallywojo]

with very few hands people usually give you credit, so i doubt someone is playing back at you. If they were shortstacked now it is a different story, but they have well over 100BB so I give them credit and easily fold.

[pokerchap]

i fold here unless its a huge fish who would have KJ/AJ/QJ