My embarrassment in U.S.

We have learned English for a long time since we are in primary school, but we didn't learn the authentic Eglish. The pronounciation of many words are wrong, and native speaker can't understand what we say. When I came to America, I am very confident with my English. I am never shy, and I think American are very friendly, so when I have some questions, I always asked someone for help. However, when I talked to a native speaker, they coulden't understand what I said. I feel confused, because I thought I explained very clearly. After I described in another way, they had a "aha" moment. They pronounced the word in a different way, and asked me was that waht I said. I felt very embarrassed at that time, and I feel what I learnd just called chinglish.