[Shattered]

Preflop: Fold
Flop: If you're playing A7s UTG you absolutely have to c-bet, that's a dry flop and a great place to try and swipe the pot especially after an UTG raise. If they're "always calling or raising you," you definitely have to tighten up out of position.
Turn: I probably fold if BB's a reasonable player (or even an unreasonable passive player), he's representing an ace or better and any kicker beats you. Against an unknown I call against and fold to most river bets.
River: If I'm going to raise here I'm going to shove it all in. Given action, I probably just call because he potted the river and that's often a very big hand, though I don't hesitate to shove with the right read.