Sebastian Vettel says his impressive first season as a Ferrari driver has gone 'against the odds', admitting his tough 2014 season left him doubting his abilities.

After six successful seasons in the Red Bull stable - which yielded four consecutive world titles between 2010 and 2013 -, Vettel made the move to Ferrari for 2015 and has proven a frequent thorn in the side of the otherwise dominant Mercedes' with three wins in Malaysia, Hungary and Singapore.

Currently second in the standings with four races of the season remaining, Vettel's renewed success comes after a tough 2014 campaign which saw him struggle to adapt to the new regulations in Red Bull machinery.

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Indeed, having had his ability questioned during those four title-winning seasons due to the car he was driving, Vettel admits the downward spiral in 2014 left him doubting his own talents too. Nonetheless, having been prepared to wait for success with Ferrari - which itself struggled last season -, he says the race-winning success of his 2015 campaign has gone beyond his expectations.

"I am not ashamed to admit it - everybody doubts himself at one point or another," he told the official F1 website. "For sure, 2014 was not a nice season. I was not performing the way I wanted to perform - and if that happens it is more honest to show your feelings and not hide behind a fake smile. So about the same time last year I understood that it was time to move on.

"The stage I am at now proved me right. I am very happy with how things worked out. Sure, when I joined Ferrari there was never any guarantee in terms of results, but now it is nice to know that we've exceeded all kinds of expectations, including mine. It was a dream come true when I joined - and against all odds the first year so far has been amazing.

Vettel also reveals he had had contact with Ferrari before his decision to move in 2014, but insists the timing to leave Red Bull wasn't right until last year.

"I don't want to be arrogant, but I was already in contact with Ferrari," he continued. "If you are in the paddock you meet each other every now and then. So I'd had conversations before, but back then the time was not the right one. Suddenly last year it was. That made all the difference."