NEW DELHI, India - Force India driver Paul di Resta has his uncertain future in Formula 1 though pointed out he was not the only driver facing problems.Resta's poor run of form in the second half of the 2013 season has fuelled speculation that Force India might replace him with Sauber's Nico Hulkenberg. His dip in form coincided with a change in the compound and structure of Pirelli's tyres but did not deny that his F1 future hung in the balance ahead of the Indian GP.'CONTRACT DOESN'T MEAN A LOT'"It's tough because of circumstances that don't help drivers without funding," he said. "The team knows what I can do. It gave me the tool to achieve what I can."Team mate Adrian Sutil confirmed he had been in talks to secure his 2014 seat: "Yes, of course, I know them very well after so many years. It's open talk. Half the field is uncertain. Nobody knows where it goes, it can change very quickly. Even a contract doesn't mean a lot nowadays."Sutil would not elaborate on the outcome of his negotiation with the team management but was already talking of an improved performance next season.Sutil said: "I'm looking to a good future in 2014 year and I hope it will be a very good year. It has to be a good one because we stopped very early (this year) with the development. So the car has to be doubly good."