Firing the third barrel

[Muisyle]

Party Poker No-Limit Hold'em, $ BB (6 max, 5 handed) converter

BB ($100)
UTG ($45.54)
Hero ($127.2)
Button ($152.55)
SB ($291.05)

Preflop: Hero is MP with A[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $0.5.
UTG calls $1, Hero calls $1, <font color="#CC3333">SB (poster) raises to $1.5</font>, <font color="#666666">1 fold</font>, UTG calls $1, Hero calls $1.

Flop: ($7) 4[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">UTG bets $7</font>, <font color="#CC3333">Hero raises to $20</font>, SB calls $20, UTG folds.

Turn: ($54) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets $35</font>, SB calls $35.

River: ($124) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets $60</font>

I was really just trying to get all in with the shortstack (I'd rather he fold of course.) who likey had a small overpair, but when the other guy overcalled I kind of got myself in a situation. In a smaller pot I would just check through the turn to try and hit my draws, but I would have to give up the pot if I missed the river. I'm not really worried about a 4 here, he either has an overpair or a flush draw himself. How stupid is this?