I enjoyed myself at the party.

我在聚会上玩得很开心。

《牛津词典》

I haven't enjoyed myself so much for a long time.

我好长时间没有这么快活了。

《牛津词典》

I enjoyed myself at Disneyland.

我在迪斯尼乐园玩得很高兴。

youdao

I've enjoyed myself since I've come here, everyone's made me really welcome and I can't wait for Saturday.

BBC: Haldane pleased for Vale lifeline

That was Monday, and I ran 21 kilometers and enjoyed myself, even though it was raining, because I was in control.

FORBES: Running (A Business): Bankruptcy, Publishing, Poison Ivy and My Crappy Week

I've really enjoyed myself.

BBC: A term older and wiser?