After making three consecutive All-Star games, Deron Williams had grown accustomed to being part of that elite group. Now, for the second straight year, the Nets’ often-injured guard will be on the outside looking in. For Williams, the past season-and-a-half has been maddening. It’s not missing Sunday’s game that galls him, but being robbed of his former star form by injury. Nevertheless, Williams said he can get back to that level — and the Nets know they need him to in order to get to where they want to go in the playoffs. “I just want to get healthy again, man. If I get healthy, I know what can happen,’’ Williams said after Tuesday’s practice, as Brooklyn prepared to play host to the Bobcats on Wednesday. “It’s been a frustrating two years for me injury-wise. It’s something I can’t really control. Hopefully I can figure it out this summer and then go from there.’’ A dozen spots on the last two All-Star rosters went to nine different point guards, and it was sobering to the Nets’ franchise player he hasn’t been among them. Chris Paul, Tony Parker, Kyrie Irving, Russell Westbrook, Jrue Holiday and Rajon Rondo — who didn’t play — all made the squad last year. John Wall, Steph Curry and Damian Lillard replaced Westbrook, Holiday and Rondo for this weekend. That doesn’t even include Chicago’s injured superstar Derrick Rose. “Yeah, I think that there’s so many talented players in this league, so you’re not given that automatic bid,’’ coach Jason Kidd said. “With some of the injuries that he’s had early on, for us it’s a matter of him playing well, going on from here and into the playoffs; and next season we’ll worry about the All-Star Game.