Hey man I have the EXACT same problem and its really ruining my life. I used to be normal, I really don't know how this happened. I have the same thing with the walking too. I start to wonder if I'm walking funny which in turn makes me walk funny. Then I start thinking everyone is looking at me. I get super anxious in public, especially places with alot of people. I start freaking out inside. I avoid girls because, even ones I know like me, because I know that dating would require me to go places. And I also avoid them because I get really anxious and nervous, and I dont know what to say or how to act. This is a big problem and its killing me man. Did you ever seek help? If you've and advice I'd love to hear it.