Pastor Maldonado is "hoping" to remain in Formula One next year, but he concedes "you never know".
The Venezuelan has had three mixed seasons with Williams as he picked up only one point in his debut campaign in 2011, but he bounced back last year with a maiden race win in Spain and 45 points for the season. This year has also been difficult as his P10 in Hungary is the team's only point to date.
The Grove squad are yet to confirm their line-up for 2014 and Maldonado, who has been backed by state oil company PDVSA since his debut, concedes his future is uncertain.
"I hope I will be on the grid, but you never know," he told Autosport.
"It could depend on the [financial] support or not, you never know. Formula 1 is like that.
"Last year I was winning races, today I'm nowhere.
"This year I'm here, next year I don't know where I will be."
The 28-year-old Maldonado also rued another poor season for Williams, saying "it's better to stay at home" than to struggle at the wrong end of the grid.
"I really need a good car to enjoy it, and this year I'm not enjoying it," he said.
"I'm living a really bad moment and I need some motivation to keep doing my best. I want something more. I'm here for something more.
"I don't want to just be in Formula 1, to be honest. It's better to stay at home, if it's like that.
"I don't care about being a Formula 1 driver, I'm here to win and I need to do whatever it takes to be there."