Walcott said: "That was one of the messages I did get across," Walcott said. "I just wanted to be shown a little bit of support for being here.
"But it was the manager's decision and it worked out to be the right one because we won the game in the end."
As Walcott concedes, Stuart Pearce's decisions have come off. The first was to take Walcott off at the break after a poor first half against the Finns.
"Even my parents booed me off at half-time against Finland," Walcott joked.
Pearce then unleashed a furious Walcott on the highly-fancied Spanish and he set up James Milner's clincher that allowed England to rest players for the draw against Germany.
Next is Sweden in the last four on Friday evening in Gothenburg, with Walcott still upset and looking to make his mark again.
"Against Spain, I took it out on the pitch and let my feet do the talking," he said. "People probably saw me around and about and I wasn't too happy obviously because I came here to play.
"If you are not disappointed there is something wrong, you're just here for the social.
"You've got to be angry coming on the pitch. You don't want to be too angry and get sent off but hopefully I'll be at it on Friday."