你有时很自私的。——不，我不自私。

You are very selfish sometimes. — no, I'm not.

youdao

我对人很好，我不自私。

I'm so nice, I'm not selfish.

youdao

我从没见过他不自私。

I have never known him to behave other than selfishly.

《牛津词典》

I might not know whether I'm playing someone who's an evil git or an indignant angel.

我不太清楚到底我是在和,自私鬼还是愤怒天使博弈

耶鲁公开课 - 博弈论课程节选

I wish that that weren't the case, but people are selfish.

我不希望这种现象存在，但人都是自私的。

不平等的赞助入学 - SpeakingMax英语口语达人