He’s the only popular kid at the party, and it’s getting pretty late already. Weren’t there supposed to be other big shots here? That’s what he was led to believe. But Mark came way late, stopped by for about a half-hour and then took off again. Curtis arrived a little earlier than Mark and slipped out after just 15 minutes, before Mark even showed up. Derek vowed he would be here at the beginning, only to get delayed, and he’s not entering anytime soon. Alex was a “maybe” from the outset, and he might get banned from all parties for a while. Which leaves just Robinson, who is trying to keep the bash relevant, but admitted it isn’t easy. “The first thing you’ve got to understand, that’s part of life. Nobody wants to get hurt. Everybody wants to stay healthy and be able to help the team win games,” Robinson Cano told The Post yesterday, before the Yankees defeated the Rays, 6-2, at Yankee Stadium, ending a two-game losing streak. “But at the same time, it’s hard, because when you’ve never been in a situation like this before, it’s real hard. “You’ve never been in a situation like this, so you have to figure out how to stay mentally and physically strong.” By “a situation like this,” Cano meant the Yankees’ injury epidemic. “The other years, we had most of these guys,” he said. “I’m the only guy, I think, in the starting lineup from last year.” That’s true, in spirit. Cano is the only guy in this Yankees’ starting lineup who spent all of last season in the team’s front nine. Brett Gardner missed nearly all of 2012 with a right elbow injury, and Ichiro Suzuki didn’t come aboard until last July 23. None of the injured quartet of Mark Teixeira Curtis Granderson, Derek Jeter and Alex Rodriguez is expected back before July. That has left Cano surrounded by Gardner, Ichiro and a surrounding cast of characters whom he never could have anticipated calling teammates. Consider that last night, manager Joe Girardi fielded a lineup that featured Lyle Overbay hitting fifth and rookie Zoilo Almonte sixth; that worked out well, as Almonte homered and singled twice in his first major league start.