The rookie championship leader said his own mistakes, coupled with Lorenzo's excellent early pace, had allowed the Yamaha to escape.
And while he conceded that both Lorenzo and Valentino Rossi appeared to be more competitive due to the new gearbox, Marquez insists he is not concerned Yamaha could suddenly jump ahead of Honda in the pecking order.
Asked if he was worried about Yamaha's apparent upturn, Marquez said: "No - sure the seamless is some advantage, some improvement, but for me it is OK.
"I feel good with Honda, I feel strong. [Even if Yamaha has the] seamless we can be there.
"Maybe we were ready to fight for victory but I did too many mistakes - my first was at the start, my second when I ran wide and the last when I lost time [at Turn 8].
"I recovered my feeling and tried to do my best, closed the gap to Dani [Pedrosa] and had a nice fight and tried to close to Jorge but saw it was too much risk.
"Without those mistakes sure we can be a little bit closer, but Jorge was stronger than us, especially in the first five laps. We need to congratulate him."
Marquez insisted that he will continue to attack over the remaining five races, but acknowledged that his current 34-point cushion will enable him to seal a rookie title even if Lorenzo wins the final five races.
"Thirty-four points is a good distance but we try and keep the same mentality," Marquez said. "For me it will be the same; I will be the same Marc and push like now.
"In the end though we did our job: Jorge did a perfect race, and we finished second. He recovered five points."
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