da gibt es verschiedene Varianten, und es liegt natürlich auch immer daran, wie gut die Beziehung ist, um welchen Bereich es geht etc. Trotzdem mal ein paar Vorschläge: "May I ask if I have made a mistake/something wrong?" "I am afraid that maybe I have made a mistake?" "Please tell me, was it wrong what I did?" "I would be glad to hear from you if I have done something wrong/if I have made a mistake." "Please just let me know if I have made something wrong/a mistake."