totaly lost

Flop call was fine, using your position to see how the turn develops before committing to the pot.

Turn, I think you have to cry and fold.

You have a nice draw on the turn but you have been priced out of seeing the river card. If you do call and don't hit your flush you will have to fold to a river bet and I don't see you having the odds to call. Also you're not closing the action so there is a slight chance you will get checkraised if you do call.

Preflop: You ask, "Do I have to 3 bet preflop?" It's already 3-bet to you. Your hand is in the top 4.3%, the equivalent of 99 or AJs in Hold'em, which IMO isn't in "must play" territory, especially versus a 3-bet from a "very good" player, plus an UTG min raiser who still poses a threat. The 3-bettor's represented AA dominates your A. I say fold preflop if he's not loose on 3-bets.

Turn: The preflop 3-bettor's bet is not a show of strength. Back on the flop, he only called a laughable weak donk stab, then you showed weakness by just calling behind (fine on your part), and then the weak stabber checked the turn. It looks to him like nobody has anything more than top pair. He could profitably bet here with any four cards, though he probably has AA. If he has AA, then with only two other cards in his hand he probably does not have 74 or 55 to back him up. So raise all-in and take it down. There is almost no chance that the checker is planning to check-raise, because only 74 is strong enough to consider it, but 74 would fear the two flush draws and bet out full pot. Likewise, the less-than-full-pot bet from the preflop raiser screams that he does not have the nut straight. If you don't run into AA55 or AA42, I think you're golden, and if you get called, you've still got the flush outs. I don't think a naked AA will call, because he's a "very good" player and a zillion players saw the flop.

Disclaimer: Ribbo is the one you should be listening to.