The London Irish back made his first international start in 17 months on Saturday in England’s 23-19 win over Wales.
The 27-year-old hopes that his performance was enough to win back the fullback shirt from positional rival Ben Foden.
“I felt like I missed a lifetime of rugby,” Armitage said.
“I have got that hunger again. I really want to be involved for England. I want that 15 shirt. I am pushing Ben. I want that shirt back and he knows it.”
Armitage fell out of favour with the England selectors following a string of discipline problems and bans last season, but was called up to the preliminary World Cup training camp of 45 players.
Coach Martin Johnson will name his 30-man squad on August 22.