The London Irish full-back was banned twice last season, including an eight-week suspension for shoving and abusing an anti-doping official which ruled him out of the RBS Six Nations.
Armitage enjoyed a fine introduction to international rugby in the 2008-09 season and the England management kept faith in him.
The 27-year-old was allowed to train with the squad during his suspension and on Saturday will get his chance to start a Test for the first time in 17 months and press his claims for World Cup selection.
"It is no secret I have found it hard to manage by emotions," admitted Armitage. "I play the game with passion and sometimes with a little bit too much. That is what I have been working on. I like playing on the edge, it just needs to be a little bit controlled sometimes.
"The last year didn't go as well as I wanted it to. I am just glad I am here with an opportunity to get back in the squad.
"I want to play for England and nothing is going to stop me getting where I want to get. It has been a long wait for me.
"What happened, happened. I felt really bad about it but now I am back focused on playing well for England and trying to get into the World Cup squad."
Armitage made his Test debut in Martin Johnson's first match in charge, against the Pacific Islands, and could consider himself unfortunate to miss out on Lions selection in 2009 after an eye-catching season.
But as England continued to struggle, so Armitage began to lose his spark and then his form.
The England hierachy eventually lost patience and after being substituted during the Six Nations draw against Scotland in 2010, Armitage was dropped altogether for the trip to France.
Armitage described that experience as the lowest point of his career and that being axed, although nothing he did not expect, had left his confidence "broken".
He has won a handful of replacement caps since but only now does he feel back to his best and ready to make an impact again.
"That seems like a long time ago now. I am really confident, raring to go. I am excited about this weekend and all that is forgotten. It is about the future and playing for England," said Armitage.
"I have been working really hard and my aim was always to get back in the squad and play for England.
"I want to get back to that feeling again, that enjoyment. There is nothing better than wearing the England 15 shirt every weekend.
"This will be a great occasion, having not played at Twickenham for a while. It will be amazing in front of a sell-out crowd."
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