tenses - Is my usage of 'had been' correct?

I am writing a story in first person singular past tense...Is the following usage of 'had been' in the sentence correct.

Canab was a massively multiplayer online game designed and developed
by Digital Dreams which was started ten years back. It had been five
years that I was working as a game designer.

Answer

It is a passive voice but I use it all the time. My editors are fine with it. I use Grammarly and it doesn't like the passive aspect of the words however when I tried to change it to a non-passive the sentences sounded jerky.

Hope that helps.