(8 max)
MP：605
SB（HERO）：165
BB：417
Straddle：350

pot : 15 ( SB :1 ,BB :2, Straddle:4, ante :1)

pre flop : MP raises to 16.6 (pot 15) , I 3-bet 47.22(pot 31.66) , Straddle and BB cold call ,and MP calls too
flop: 5♦️6♣️2♦️ ， now the pot size is 196

I only have 120 now, and I thought no one Re-raise before the flop , most of them have small pair and AQ, KQ ,AJ,something like this. so i bet to ALL-in

and the BB calls me with 77 ,then win the pot .

so what would you do with this hand? and i did it wrong ?