I was feeling guilty.

我感到歉疚。

《牛津词典》

He was feeling guilty and depressed, repentant and scared.

他现在觉得既内疚又沮丧，既悔恨又害怕。

《柯林斯英汉双解大词典》

Kids might end up feeling guilty, or resentful.

最后孩子自己感到负罪或者怨恨。

youdao

People feel guilty at times feeling good about themselves.

人们在自我感觉很好时会内疚。

哈佛公开课 - 幸福课课程节选

Suppose I get an A and my pair gets a C, then sure I get that initial payoff of 3, but unfortunately I can't sleep at night because I'm feeling so guilty.

假如我得到A我对手得C,没错我开始得到3单位效用,但我感到愧疚,我因良心受到谴责

耶鲁公开课 - 博弈论课程节选

In other words, one of the reasons we cooperate with others is to avoid feeling guilty.

FORBES: The Neuroscience of Guilt Uncovers the Origin of Cooperation

And right now I'm feeling guilty because I've got a first draft that needs honing.

NPR: Grigsby Bates on Her New Mystery Novel

Bill Clinton's real legacy is that he has allowed America to stop feeling guilty about capitalism.

CNN: Tucker Carlson: China vote creates political winners