Rubens Barrichello insists he isn't giving up his place in F1 without a fight as he prepares for the final round of the 29011 season in Sao Paulo this weekend.

The Williams driver has endured a difficult season with the uncompetitive FW33 and his future is currently unclear, with the team yet to announce its drivers for 2012 and reports that Kimi Raikkonen could join the team in his place.

However, despite the reports, Barrichello insists he is still more than capable of doing a job for Williams next season, with the 39-year-old saying that his drive last time out in Abu Dhabi was a sign that a sign that he still deserves his place on the grid.

"My mindset is positive," he was quoted by Sporting Life. "I'm not going to say goodbye to people. After races like the last one in Abu Dhabi I deserve to still be in Formula One.

"I'm not doing it because of the money or because I want one more year in F1. I'm doing it because I enjoy it so much. I still think I am so competitive and deserve to be here. Twenty years (in F1) at 40 years of age. I want to be there and I'm working my balls off for that to happen."

Despite Williams enduring the worst season in its history, barring a strong result this weekend at Interlagos, Barrichello said he felt there would be no repeat next year - with the team having undergone a series of changes behind the scenes over the course of 2011.

"On the engine side, structure, new thinking, motivation, everything can be a big step to next year," he said. "That's what I believe. I don't know if it's going to be a winning car, but it's going to be a hell of a lot better.

"The new people have really changed the vibe. The problem this year was that people left, others came in, and in between was a missing three to four months. There was no leadership at that time. That was the problem, but people are acclimatising quite well.

"They've done everything they could to improve this car, which is a very bad one, so they are putting all their efforts into a new one."