I wasted my time when I would try, try, try.

我浪费时间当我会试，试，试。

youdao

I wasted my time and my effort on this project. The boss rejected it.

我在这个项目浪费了时间和精力。老板否决了。

youdao

I shouldn't have wasted my time associating with those people.

我不该浪费时间和那些人交往。

youdao

Passing through puberty, into adulthood and now into middle age, I've wasted a lot of time lamenting the size of my hips, the gray in my hair, and the lines in my face.

NPR: I Am Not My Body