A5s in the CO all messed up

[carniplant]

Button is LP 60/1 preflop passif postflop
SB is LP 40/8 average aggression postflop
BB is 75/5 average-moderate aggression postflop

I thought about taking a different action on every street my thoughts in italics below.

Party Poker 2/4 Hold'em (6 handed) FTR converter on zerodivide.cx

Preflop: Hero is CO with A[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises</font>, Button calls, SB calls, BB calls.

Should i just fold preflop considering the ligneup?

Flop: (8 SB) 5[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">BB bets</font>, <font color="#CC3333">Hero raises</font>, Button calls, SB folds, BB calls.

BB's bet could be any pair or draw he's highly eradic considering he 75/5 pre, I'm hopping to get h2h in case i'm ahead if not i figure i've got plenty of outs, i did consider just calling because while my equity is surely high my hand may not be best and i'm hurting my implied odds if I improve.

Turn: (7 BB) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, Hero checks, Button checks.

I think about betting but after getting called in 2 spots with the 4 pairing i'm not sure i'm best anymore, I'd hate to get c/r here and these guys never fold a better hand. With button being as passive as he is i'm pretty sure he will check all but his monsters on this turn so I figure i'll get a free card and get to re-evaluate on the rive.Should i just bet and fold the river UI if c/r by sb ?If just called check river(i'm folding if button bets)

River: (7 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">BB bets</font>, Hero calls

Thats about as blank as it can get on the river so i call given my turn play and show of weakness.