BraceBrace you seem to be indicating that flying a given track is difficult. It's really not that hard and all pilots manage it when learning to fly in order to navigate to a given point. Maybe your instructor hasn't covered that yet but don't worry, you'll get there.
When flying a visual circuit yes, turns are 90°. If the runway direction is 180°, downwind track is 360°, base is 90°, and final is 180°. It's very simple and there's no need to worry about air masses.