How to counter Zarya except just "dont shoot bubbles"?

Thing is, I play Zarya myself and most of the time it's just a stomp, you got 1 or 2 enemies who actively shoot me and feed my energy and I just kill everyone. But how to counter her? In lower ranks you'll always have that one guy who actively shoots her bubbles so how are you supposed to win that when she's running at full charge always. Any tips on who to pick? Anything, tanks dps whatever. Just struggling sometimes when I have to play against her