it sucks to get sucked out on the flop like this but this situation will come up alot.
ur flop bets have to be more. this should be at least 2.25
and fold river. 57 got there, trips got there. there wasnt a fd on the flop.
if ure gonna bet just $7 bucks im sure u can fold this and save the rest of your stack really obv u were beat.
its very impt to know players at these stakes dont make crazy plays or river reraises with air and 90% of the time ure beat and they are not making plays at u