How I started Writing Stories. {Words in titles are capitalized}

Hello everyone.

I'm not a writer (I'm only studying {to be(come) one}), but sometimes, I take a pen or keyboard(?)* {laptop?} and write small stories for children and adults...about life and miracles :) And when people hear that I write stories, they often ask me how I (got) started writing? And I always tell this story.
When I was a 12 years old, I had many friends. And one night in the each month, we would came go to someone's of us house and was would imagine and telling stories the whole night {or "all night long"}. This stories must have been had to be invented, it was the a strong condition. {better="it was mandatory}
I invented {or "made up", avoids repetition} and told stories every night, and I couldn't stop. So... that was why I started writing. :)

*Do you mean a "tablet" or "laptop" here? A keyboard would just be the accessory with the letter/number keys and wouldn't be able to write or save anything.