After joining the Blues, Torres endured a period of poor form, but his performances improved at the turn of 2012, with the striker's pace and attacking prowess catching the eye.
The Spanish international's season ended on success, lifting the Champions League and FA Cup with Chelsea and winning Euro 2012 and the tournament's Golden Boot with Spain in July.
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"I learned so much about myself last season and feel better for that experience now," Torres told ESPN.
"I'm playing much more for my club and you can see that I'm starting to score more goals and play better.
"I am a different type of striker than in the past. I created a lot of chances for my team-mates last season and it means my game is more complete at this point in my career.
"To play in a new Chelsea team and still have something to aim for with Spain is exciting for me."
Spain open their World Cup qualifying account against Georgia in Tbilisi on Tuesday night, and Torres will be looking to kick-start his season after picking up his 100th cap for his country in a friendly against Saudi Arabia on Friday.
"The night of my 100th game for my country is something I will always remember," he continued. "Many Spain players have reached 100 appearances and this says so much about the consistency of the team in the last few years.
"More will follow to get to 100 - Sergio Ramos and Cesc Fabregas for sure - but it was a special moment for me. Even after so many years, it is still a privilege to play in this great Spain team."