Pakistan wicketkeeper Kamran Akmal has expressed his disappointment at losing his central contract for the second half of 2011, but said he is determined to prove his worth in domestic cricket and make a comeback."I'm extremely disappointed," Kamran told PTI." I admit that it was my mistake but I think I deserve another chance. Somehow it's the board's decision and I don't want to say much. I've earned the contract for eight years and losing this one is not a big deal.Kamran was dropped after struggling in the World Cup and was replaced by Mohammad Salman for Pakistan's tour of West Indies. "The selectors were not satisfied with my performance but I just need to keep on playing domestic cricket and prove my form to them," Kamran said. "I'm 29 and fit so I feel that there's at least six years of cricket left in me."Everyone makes mistakes but the important thing is learning from them. I vow not to make them again. No wicketkeeper loves to drop catches."Kamran was not the only active player to lose his contract. Shoaib Malik, Mohammad Yousuf and Danish Kaneria, who were not picked for the World Cup, have been ignored. Malik and Kaneria are yet to be cleared by the PCB's integrity committee and Kaneria has not played for the national team since August 2010. The recently retired pair of Shahid Afridi and Shoaib Akhtar were also left off the list.