翻译英语“当我年轻的时候，我不知道我要做什么事情”

I had no idea what was best worth doing at a younger age.

For your reference:
True wisdom is to know what is best worth konwing ,and to do what is best worth doing .
真正的智慧是知道什么是最值得知道的事情和什么是最值得做的事情．汉弗莱

When I was young, I didn't know what I needed to do.

when i was young ,i did not know what i wanted to do .

when i was young,i didn't know what i would do~

when i was young ,i had no idea what to do

When I was young , I didn't know (had no idea)what I would(should) do.
When I was young, I didn't know(had no idea) what to do.