It just sounds to me like you lack social skills.
Just join a server and participate in what activity is being done, stay around, and talk with the people there. Soon you'll start to do foolish/silly/fun stuff and then they'll wanna be friends.
Just the other day I was playing on the Slopes CTF and I asked "who wants to go on a flag run" meaning flying to the other base, grabbing the flag and returning it.
Some dude said "I will" and he jumped in my plane and we rammed into their base and went guns blazing.
After we inevitably died, we laughed about it, and said "lets go again!" We kept doing it having fun together, then he asked if I had RTB and now we'll probably hang out doing other stuff we like sometime.