Hello, everyone.

CO unknown reg 100bb
SB loose fish on the passive side 145bb
BB Hero 145bb KTo

Preflop

EP, MP fold, CO raise 3bb, BU fold, SB call, Hero call

Flop J 9 7 rainbow, pot 9bb

SB check, Hero check, CO check

Turn Qr, pot 9bb

SB bet 4.5bb, Hero raise to 19.5bb, CO fold, SB call

River 9, pot 48bb

SB check, Hero bet 36bb, SB goes all-in for 122,5bb, Hero ?

So, ugly river spot. From my experience that's either boat+ or some random spew with hand like Q8o, but I doubt frequency of spews is sufficient to justify a call. For me those spots are very taxing on my mental stamina and would appreciate any advice on how to deal with it.

Usually I make a call and would consider folding nutstraight a mistake against a weaker opponent, but is that false thinking? Ultimately straight on this board that deep is a bluffcatcher and I wonder if villain will bluff often enough?

I would also appreciate sizing advice, especially on the river. I think betting big against a weaker player is a must. Should I go even bigger on the river?

Thanks for feedback.

Cheers!