Felipe Massa has admitted that he is somewhat frustrated by the way his Williams career has started.
After the first four races of the season, the former Ferrari driver has amassed only 12 points, and while he looked destined to finish in the top six in China last week, he had to settle for 15th place - one lap down - after he lost almost a minute because of a left rear wheel problem during his first pit stop.
"I'm frustrated for what has happened [in China] and I'm frustrated for what has happened in many races," Massa told Autosport.
"The first race, somebody [Kamui Kobayashi] pushed me out and I lost massive points then [in Bahrain] I was fighting...
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