跪求 主题是shyness

（以下是一篇小短文）"I am a Chinese girl,I major in Marketing.But my English is very good.
Every time I talk to foriegn teachers,I fell my face turn red.I don't why.So do I talk to my classmates in English.
I know that a student who shudy Marketing should speak fluently when you meet a new person .
So I should spend more time to overcome the shyness.