According to my English-speaking pen pals , my English writing skill is good , but when it comes to speaking English , my fluency is not as good as it should be.

Based on what my English speaking pen pals have told me, my writing is good, but when it comes to speaking English, I'm not as fluent as a right and proper speaker. P.S. I hope this helped you.

I'm not completely understand you,but I think your meaning is these My English speaking pen pal has told me that my writing is good,but when I open my mouth ,my speaking is not fluent and proper