Beggars can't be choosers.
I myself have worn a mask for a long time. You are saying you want to be yourself. You are, apparently, someone who wears a mask. Why not be that? I have met numerous great people by wearing my mask. I have become very conditioned to having it on. It used to get tiring to wear it. Now, I only rarely get tired and if I do, I just retreat to the comfort of solitude for a while, tell people I am dealing with something, and they accept it.
My mask has become a large part of who I am. Take sports for example. At first, I was a bit of a brain, musician and a bookworm. However, my father felt it necessary to force me into sports from a young age. Initially, I hated it, and only tried to excel to make him happy, which brought me boyish joy. When that faded, I did it to maintain connections to people, "friends" if you will. It was still a burden, but one I became used to bearing. Now, sports are a great outlet for me. They relieve stress and give me a chance to achieve glory and have camaraderie. I pride myself on the body sports have built for me. I played numerous sports as a child. Football, baseball, hockey, lacrosse, soccer, and basketball. In highschool, it was mandated to do an "activity" each season. As much as I might have liked to retreat into the great curriculum offered and put sports on standby, "art" did not seem like a good activity for me, as I suck at arts, so I chose to continue in football, hockey and lacrosse. I ended up ending my highschool career as a football captain and all-new england lacrosse player. I quit hockey senior year after a problem with the coach, and captained a "personal fitness" team as an alternative to art as an activity, and organized competitions with other prep schools in the area.
Though looking at my life from the perspective of my childhood this does not seem a likely path, or a healthy one, and though at first I did not like it, doing something outside of my comfort zone has bettered me as a person, expanded my horizons, and has let me meet a diverse and interesting group of people. Like-mindedness is not the only qualification for friendship. To those close enough to me to see a little behind the mask, I add something to their lives as they have to mine.
Now I am in college and have retired from my classic sports. I have a chance to focus on studies, which I love. I stay active though. I play rugby, as it is not an NCAA sport and thus is run by the players and not the school. This provided me with an immediate friend group and older mentors. I also helped to found a fraternity, and as a founding father, I am able to add my own values and spin to the creation, and in future years, the vector I placed it on will help attract like minded people to pledge.
Though I do not agree that your predicament is truly a predicament, I will still try to help. Places I found somewhat like minded people: Honors/AP classes. National Youth Leadership Forum on Law (though that was invite only. I guess get your name out there so that if things like that happen, you get invited). Starting clubs for things I was interested in. I love Harry Potter (the books, only) so I started a Harry Potter club in highschool. We spent the entire first meeting wandering around campus looking for sticks and then whittling them into wands, talking about anything and everything. Those were great conversations. You can even just start a random conversation about something you are interested in and see who takes.
Yes, I will admit that sometimes I was sad that I never found many people a lot like me. But if you are pro-active, it can be done, and you don't have to go around wearing a sign saying "I am different then %97.2 of you. Searching for the other %2.8"