Robert Pattinson’s sexy brooding isn’t an act: The “Twilight” star is seriously bummed by New York … and its women!

On-set sources from the hunky Brit’s new film, “Remember Me,” now filming in the Big Apple, reveal that the actor is hopelessly homesick for London.

“Robert is dying to get back home,” says an insider. “He’s so over everything. He’s overwhelmed by all the girls — they terrify him! He says girls grab his neck and clothing all of the time, and he’s not used to that. Fans don’t do that to him in London. Everyone there is a little cooler about the fame thing, which is what he’s used to.”

The star’s blatant unhappiness even has his “Remember Me” co-stars concerned. “He’s so skinny and stressed. Everyone on set is worried about him,” confesses our source.Clearly Pattinson, who shot to fame as teenage vampire Edward Cullen in “Twilight,” isn’t enjoying his heartthrob status — or the female attention. “Robert doesn’t understand why everyone is going so crazy over him,” continues the insider.

“He’s embarrassed by the way girls throw themselves at him. The girls here are stalking him. He stayed in two different hotels over the course of four days just to try to escape the fans who were following him. He’s afraid that if he gives a hand, they’ll take the whole arm. He’s being advised by security not to encourage the crowd, so he doesn’t even look up anymore.”

True to form, the gorgeous star kept his head down early last week at the Crestwood Train Station in Yonkers, where “Remember Me” was filming. During one break, he headed to local bakery Martine’s, where an eyewitness observed, “He was completely silent in public, but when he got back to the crew, he was saying how glad he was to be away from prying eyes in Manhattan.”

This isn’t the first time that Pattinson’s public paranoia has reared its head. He told an Australian magazine back in June that he started crying while shooting “New Moon” in Italy because, “I [cry] when people are screaming at me.”

At least he can find solace from his homesickness with a few nights out on the town — we’ve spotted Pattinson drinking at local spots like Black and White, the Bowery Hotel, Freemans and Webster Hall.

Sources: NY Times