No call on Flop cost me $1700 pot(30-60). Please advice.

[Jacob]

Very loose and aggressive 30-60 game. I missed my blind so had to post in CO position. I get 8s5s. UTG raises 3 people call. I also call. 5 people see the flop. $345 in the pot

Flop - 7d4d3h. All check to MP. He bets. 2 more call. I think about it and fold. There is $435 in the pot and the only card I feel safe with is non diamond 6 giving me nuts. Moreover I am afraid UTG(pre flop raiser) is checking a very good hand(probably a set) and action is not going to stop at one bet. I have been playing with all 3 MPs for over 6 months and am sure this flop had to hit atleast one of them. Even though the pot odds and making my hands are very similar at 15:1. Anyone agrees with my line of thinking.

UTG raises and all the other three call. $585 in the pot

Turn - 6h. NO!!!!!!!!!!!!!. The board is 7d4d3h6h. I would have had the nuts. UTG bets. MP1 raises. MP2 calls. MP3 reraises. UTG calls. MP1 caps its and everyone calls. $1545 in the pot.

River is Kh. Board is 7d4d3h6hKh. MP3 bets. UTG calls and MP1 calls. Total pot $1725. MP3 has 52off, UTG has 44. MP1 has A5off and MP2 says he folded Ace high diamond flush draw.

I kept thinking about it all night(still thinking 2 weeks after it happened) and the only positive was that I didnt go on tilt at all.

Any advice on flop play very appreciated.