Nico Hulkenberg says he is using his tough 2013 Formula 1 season with Sauber as a chance to prove his character, rather than bemoaning his team choice.
When Hulkenberg left Force India for Sauber at the end of last year, the Swiss team had just scored four podium finishes over the season and challenged for several race wins, while Force India's limit was fourth places.
But the teams' fortunes reversed in 2013, with Force India a massive 52 points clear of Sauber in this season's constructors' standings after 10 rounds.
Yet despite eighth place in Malaysia being his best result of the season so far, Hulkenberg reckons this year's struggle will ultimately be beneficial for him.
"It is not as expected, but it is what it is," he said.
"It is a new challenge for me not to give up, not to let my head drop down.
"I made a move that maybe in hindsight doesn't look so good.
"But it's a challenge for me to keep up and still keep doing my best.
"I'm not thinking about [regrets] too much, I'm just focused on getting the best out of myself and the team and the car. I'm happy."
Hulkenberg refused to rule out staying at Sauber for 2014.
"I think the future is still open," he said.
"Me and my manager are looking at all the possible options, including Sauber.
"We're some way away from making a decision."
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