Correção de resposta "Why, when and how did..."

Why, when and how did you start studying English?

My answer

I started studying english because i knowed it would be important for my professional carrer. I started attending english class in 2006/2007, but i was young and didn't took much time to i forget english and get my mind focus on my classmates. But i studied only 2 years and i wasn't really interested in learning english,hence i didn't learned a lot.

Obs: Fiquei em dúvida no tempo verbal que deveria utilizar: learn ou learning.