FOXBOROUGH, Mass. — If you don’t think the Patriots are licking their collective chops at the chance to devour the undermanned Jets and their third-string quarterback Sunday at Gillette Stadium, then you probably believe Bill Belichick does standup comedy in his spare time.

This is what the Jets face Sunday: Bill Belichick and Tom Brady, and the talent and depth around them and their aura as the most dominant team in the league for the past two decades, and … self-doubt.

First-year Jets coach Adam Gase has done what he can to date to try to change the culture inside the locker room, where there are still a lot of players who have become accustomed to losing — particularly to the Patriots.

When you’ve been beaten down by one team as often as the Jets have by the Patriots — who’ve won the past six meetings, 9 of the past 10 and 15 of 17 — you cannot help but develop a complex. It’s human nature. When you get smacked in the face often enough, you start flinching at the mere thought of the open fist coming at you.

This is where the Jets’ collective psyches reside when they play the Patriots, who’ve won 10 straight meetings at Gillette Stadium.

The Jets — without their starting quarterback, their best defensive player, their first-round draft pick, another of their starting linebackers and one their starting receivers — know, outside of playing a perfect game, they have little chance to win this game

Their players know this. Their coaches know. And they all know the Patriots know it, too.

“That’s nothing new around here,’’ defensive lineman Leonard Williams said. “No matter who we’re going to play, people have been doubting us for a long time. [People] are always going to expect not much out of us, expect us to be the losers. But we know how much work we put in. We know that we’re prepared every game to win.

“We’re obviously not going into any game preparing to lose. We know we’re going into a hostile environment. We know we’re down some key guys, but the rest of us are going to have to do more.’’

The question is this: Is every healthy Jets player doing a little bit more going to be enough to overcome a New England team that enters the game as 23 ½-point favorites?

Is everyone doing a little bit more enough to overcome the fact franchise quarterback Sam Darnold is out indefinitely with mononucleosis, his backup, Trevor Siemian is out for the season with an ankle injury and their best defensive player, linebacker C.J. Mosley, is out for this game with a groin injury, as is fellow linebacker Jordan Jenkins?

That’s a lot of little things to make up for a lot of big personnel losses.

“I’m definitely sick of us losing,’’ Williams said.

The world expects the Jets to lose again Sunday.

“As a man, you never want to be doubted no matter what you do,’’ safety Marcus Maye said. “That’s outside noise. It’s going to be there. The only thing we can control is how we play on the field in between the white lines.’’

Safety Jamal Adams, who’s the heartbeat of the defense and seems to wake up every morning in a defiant mood, has had more of a taste of losing as a Jet than he’d care to have and is desperate to change it.

“I’ve been here for going on three years, and when have they given us a chance?” Adams said. “I’m used to it, but at the same time we’ve just to go out there and compete. We’re all going to go out there and compete.”

Defensive coordinator Gregg Williams, not surprisingly, was defiant in his confidence.

“That underdog stuff, I don’t ever get involved with that,’’ he said. “Here’s the deal: We are about this play, this moment, this day. We got to stack play on play on play on play … and don’t be surprised if we play pretty good.’’

What would a win do for this reeling team?

“It would boost a lot of morale around here,’’ said guard Brian Winters, who recited his career record against New England as 2-10.

“It would be really big, because obviously we’ve been getting a lot of hate,’’ Williams said. “But it’s a division game, they’re a great team. Going to the bye week after we get this win would be a great feeling.’’