And he added: "Being able to compete in this year's World Championships was a huge dream come true for me.
"I wanted to go there and make the semi-final and gain as much as experience as possible and I walked away with a smile on my face. I think I can [go faster]."
Pistorius, known as 'Blade Runner', was left out of South Africa's 4x400m relay team for the final, despite running in the heats.
He said: "I don't know what happened there with the management deciding they didn't want to run me in the final.
"I was a bit disappointed. I ran a national record in the semi-final and it was quicker than the South African team ended up running in the final.
FASTEST 400m TIMES
43.18 Men's World Record (Michael Johnson, 1999)
43.49 Men's Olympic Record (Michael Johnson, 1996)
45.07 Oscar Pistorius PB
47.60 Women's World Record (Marita Koch, 1985)
"But the South African team ran a cracker of a race in the final and managed a silver medal, which I don't think anyone expected."
Earlier, Pistorius walked out of an interview with BBC Radio 4 when he was asked by Rob Bonnet if he was an "inconvenient embarrassment" to the South African authorities.
Bonnet asked: "Some people regard you as an inspiration to Paralympic athletes - but it might also be said that you're a inconvenient embarrassment to the South African authorities and the IAAF because you're taking them into uncharted ethical waters. How do you respond to that?"
Pistorius replied: "I think that's an insult to me," before ending the interview.
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