Am I playing weak tight?

[me454555]

Party Poker 0.50/1 (10 handed)
Me454555 has 9[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/heart.gif[/img] and is BB

EP2 limps, MP2 raises, Button folds, SB calls, Me454555 calls, EP2 calls

Am I defending my BB with too weak a hand?

Flop(8 SB): A[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/heart.gif[/img]

SB checks, Me454555 checks, EP2 checks, MP2 bets, SB calls, Me454555 raises, EP2 folds, MP2 3-bets, SB calls, Me454555 calls

I thought the check-raise would be a pretty obvous sign that I had at least an ace. Since mp2 raised pf, then 3 bet, I put him on AK or AA.

Turn(12 BB): 8[img]/images/graemlins/heart.gif[/img]

SB checks, Me454555 checks, MP2 bets, SB calls, Me454555 folds

Mp2 bet and SB called. Not a good sign for me. Turn didn't help, so I folded

River(14 BB): 9[img]/images/graemlins/diamond.gif[/img]

SB checks, MP2 bets, SB calls

What would you have done differently. Results to come