The Chelsea striker was included in a provisional 30-man party for the upcoming showpiece in Brazil, but coach Vicente del Bosque must whittle that list down to 23 by June 2.
Atletico Madrid frontman Diego Costa is an injury concern for the finals due to a hamstring problem, but Del Bosque will give him as long as possible to prove his fitness.
And Torres is eager to make his mark when Spain face Bolivia at Sevilla's Estadio Ramon Sanchez Pizjuan in their final friendly before Del Bosque names his 23-man squad.
He said: "I've never thought that I had played my last game. I am excited to come to the national team, here I've been very happy and I feel in good conditions for the World Cup.
"You always have doubts when you're a time without coming, the other day when the coach gave the list I was very excited waiting for my name.
"My dream is the same as when I made my debut. I was prepared to come or not come, after a very strange year, in which I played little, but fortunately I am here and I will fight to be in the latest list."
"Days go fast with good atmosphere, we all want to enter in the list but it is a healthy competition, there is high level and that is a good sign," he added.
