如果你不常说英语，你可以说：

"I don't speak Engpsh very often."

这句话的来源是英语中常用的表达方式。

其他可以表示自己不常说英语的表达方式还包括：

"I'm not very fluent in Engpsh."
"I don't have much practice speaking Engpsh."
"I'm not very confident speaking Engpsh."

下面是一些带有这些表达方式的英文例句及其中文翻译：

"I don't speak Engpsh very often, so I'm a pttle rusty." (我不常说英语，所以有点生疏了。)
"I'm not very fluent in Engpsh, so I might make some mistakes." (我的英语不是很流利，可能会犯一些错误。)
"I don't have much practice speaking Engpsh, so I'm not very confident when I do." (我没有多少练习说英语的机会，所以我说英语时不是很有信心。)