sudden discovery , met such a person who taught you something unconciously

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In the past, I always paid attation to my English pronunciation.Last day, our teacher displayed two words for us, "off","of".He thought the Chinese students like to pronunce the two words incorrectly.He said the first sounds /O:f/ or /of/,and the later one is /0v/.He was talking quitely on the platform,but in my mind, there was a shock. By that time,I realized I used to say of /of/ not /ov/.I have so many problems with my oral English, but I never thought I could make such a stupid mistake.The word "of" is so often used by us everyday, and every time I pronounced it wrongly.If I must accout the times, it must be thousands at least.It compelely means a desaster for me. Luckily, before I leave my campus and to become a teacher, I discovered it. Thanks to my teacher.