Hellooo, I feel that I'm going through the same situations as well. XD
My best advice is yes, it might be mentally exhausting, but try your best to maintain neutral, such as looking as if you're listening and providing some responses. Try to find understanding people with the same interests as you, through the method above. The chances are low, but usually there are at least one or two out there.
The point is, keep the ball rolling, don't sit there in the corner, keeping silent and giving off that "I don't want to talk to you" atmosphere, since your intentions will usually be misunderstood as that.
If you're still an outcast then, I say just be proud and stay an outcast. Ever since my classmates started being good at "seeing the air through me", I just kept quiet unless I have something to say, and spent most of my time in the library doing my own stuff. (Trying to improve though)
Hope I've helped. :3