Movies
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The movie - based on the novel by Michael Lewis - revolves around a wealthy woman (Bullock) who takes in a homeless teenager who goes on to play college football.
Speaking to Extra, Bullock said: "I don't even remember saying yes [to the movie]. I kept turning it down.
"Not because I didn't like it, but because I didn't know how to do it. I didn't know how to make it the story that it deserves to be. I couldn't bring to the role what it needed."
She added: "These are the kinds of roles that actresses can mess up, and that's one of the reasons I didn't want to step into it! I didn't know how to make it as good as the story.
"I'm glad I did [it]. It's still a scary thought for me. I don't know how I did it, but I had a lot of time to prepare for it."
The Blind Side is released in the US this week.
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