I wasn't feeling especially happy that day.

那天我并不十分高兴。

《牛津词典》

If I pretend to be happy in a relationship when my true feeling clearly say something else, how can I improve my relationship?

如果我在一段关系中假装快乐，但我真实感受明显不是这样的，我该如何改善关系呢？

youdao

I laughed back, feeling happy, feeling the love within myself as it bubbled over affecting others with its energy.

我回笑着，感觉很开心，感觉自己心中的爱涌了出来，感染了周围的人。

youdao

But I didn't know how fast, so I was feeling happy,". Alonso Edward of Panama captured the silver while American Wallace Spearmon took the bronze with his season's best time of 19.85.

VOA: standard.2009.08.21

I'm glad is a pattern that you want to use in a sentence to describe when you're feeling happy.

当你感觉高兴的时候，你可以用“I'm glad”句型来形容你的感受。

I'm glad 课堂 - SpeakingMax英语口语达人

Mr. ALBARN: (Singing) I ain't happy, I'm feeling glad.

NPR: Albarn's The Good, The Bad, and The Queen

"I'm very happy as I arrive here feeling better than I expected I would a few weeks ago, " the 23-year-old said, who came through two warm-up events recently for the hard-court tournament without any further reaction.

CNN: Federer and Nadal talk up U.S. Open duel

He said Parkes stopped the car and said to her, "I hope you're feeling happy now - you deserved that".

BBC: Police at Jubilee Park - archive image