In an interview with Shortlist magazine, he said: "I struggle with anxiety sometimes, especially when promoting films like this. Just the life of doing what I do, being in the public eye, it's a stressful environment. So it's good to go and talk about the things that cause your anxiety."
The 30-year-old actor - who bulked up his muscles for his role as the patriotic superhero - says he finds it hard to talk about himself when promoting his movies as he is a very private person.
He said: "It's very difficult for me to talk about myself. You feel strange, self-aware, very foolish. Your third eye clicks on, just to try and maintain a healthy sense of perspective and you think, 'What am I doing here? I'm just making a movie, and people want all these things from me.' It seems strange to have so much fuss over a film.
"I'm an incredibly private person."
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