Why am I afraid to use English in public?

Everyone have an own experience and problem in using english in public. Acctually I also have a problem to use english in public because I dont know to speak correctly and I'm a shy person. If audiences not understand what I am saying, I feel shy and want to speak in Malay only. But I know, I cannot run away from using english anymore. I also have a problem to speak fast in English. When I'm in public, I not have confident with my languages when use english to present in public. Besides that, I just understand what people speak english but I dont know how to explain back to people in english. Although, I have a more idea to speak but I afraid to try say it. I also feel shiver when I'm in face with more a people. It can make I no idea and afraid to use english in public. At the same time, my english is broken and the people will feel fun when I using the broken english. That's why I afraid to use english in public but I can try to improve myself. I will leran more about grammar and it can improve my broken english. I also can try to speak with my friends in english.