Brad Pitt says becoming a father is the best thing he ever did.The actor - who has three adopted children, Maddox, Pax Thien and Zahara, and a biological daughter with lover Angelina Jolie - believes fatherhood is his greatest achievement yet.Brad said: "Fatherhood is the best thing I ever did. It completely changes your perspective, and it certainly takes the focus off yourself. You know, you can write a book, you can make a movie, you can draw, paint a painting, but having kids is really the most extraordinary thing I have ever taken on."The 43-year-old actor has also revealed he puts pressure on himself to succeed at everything he does in life, and is constantly striving to perfect his movie performances.Brad explained: "I'm always critical of myself, but I think it's a healthy criticism. I just think, 'What can I do to make it better in the future?' But also, 'What works?'"It's a constant study, I think, film and acting."

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