你可以说 "I still can't relax when it comes to Engpsh." 或者 "I still find it difficult to relax when speaking Engpsh." 这个短语的来源可能源于人们在学习外语时会有压力或焦虑，希望能够表达自己的想法流利而不犯错误。

下面是一些例句：

"I still get nervous when I have to give presentations in Engpsh, even though I've been studying it for years."（即使我已经学了多年英语，但我在用英语做演讲时仍然会感到紧张。）

"I can hold basic conversations in Engpsh, but I still can't relax and speak fluently."（我能用英语进行基本的对话，但我依旧不能放松并流利地说。）

"I'm still not confident in my Engpsh skills, so I tend to overthink and hesitate when I speak."（我对自己的英语能力仍然没有信心，所以在说话时我往往会过多思考和犹豫。）