The double world champion and McLaren endured a frustrating season opening race in Australia, following on from pre-season testing marred by a lack of power and reliability from their Honda engines.
Alonso, despite putting in what he called one of the best drives of his career, could only battle for the lower points positions, before dropping out of contention altogether and eventually retiring.
His team mate Stoffel Vandoorne could only finish 13th and last, after being lapped twice by Sebastian Vettel's race-winning Ferrari. That McLaren felt the result exceeded expectations was a sign of how far in the doldrums the sport's second most successful team are.
McLaren's form renewed speculation about whether the 35-year-old, in the final year of a three-season deal, would stick around. Former driver and Alonso's close friend Mark Webber also cast doubt on his future in comments to Belgian media. But Alonso told reporters on Thursday ahead of this weekend's Chinese Grand Prix:
Definitely not true. I prefer to be here than to be in the supermarket in my hometown. I keep competing because I want to have more trophies. I am in Formula One, I'm delivering at my best, I'm more prepared than ever, I'm performing at my best.
McLaren, who last won a race in 2012, went into the season expecting to make a big step up the order after a season of progress following a troubled reunion with engine supplier Honda in 2015.
Read the full article on eurosport.co.uk: Alonso: I won't walk out on McLaren