A little depressed

Yesterday evening, I called my USA customer for the quotation issues, after the ring off, I realized my spoken engish became so poor, just because I'm not confident of myself? No,,,the main point is that I didn't take the exercise for a long time..Some words and expression is strange for me~~So depressed when I realize that!!! What should I do??I really want to improve my engish, especially the spoken engish!