'I lamented' is correct and usable in written English.
You can use it to express sorrow or regret for something. For example, "I lamented the loss of my grandmother."
I lamented afterward that we had not had the clairvoyance to tape it".
In my first ever Guardian column I lamented the silliness of addiction.
In February, I lamented the fact that no American had thought of this first.
In that piece, I lamented that Trayvon Martin had been murdered by George Zimmerman "in cold blood".
I was stuck in a rut, and I couldn't figure out why. "My card times have hit a plateau," I lamented.
Last week, I lamented that Feynman, a biography about the physicist Richard P. Feynman published by First Second, had not yet appeared on the list.
In my contribution to the Destroy The Joint book, I lamented the lack of women in management in radio, let alone leading voices on air.
I lamented about the Commonwealth Games, which presumably I would now miss, along with everything else in the calendar that I had intended to play.
