Hi, good luck with the grind:
From the hands you have posted I can see why you're struggling.
Hand 1: This is just a fold pre; then you don't have any of the problems. But if you call pre, then this is a check on the river. You block his auto folds. And once the flush misses, AX can have a crying call, even without having 2 pair.
Hand 2: Calling turn overbet with Ac is fine. But SB v BB you can't really expect him to fold a flush once you shove river. And by him overbetting the turn, he is clearly saying that he has a flush.
Hand 3: I wouldn't have donked the turn. The K kind of hits your range, but then again, you would check-fold some KX on the flop. Also, you're putting more money in with now 3rd pair. I would check and hope that he also thinks that the K is good for your range and therefore checks back turn.
Rest of the hand is fine.
Would you like me to include your hands in one of my YouTube videos? It can be done anonymously.
This is my channel:
https://www.youtube.com/channel/UCAV...YMze0b0xTCM-Eg