I am a very closed off person. I like putting my hands in my jacket pocket. Dont really put them in my jeans pockets. I cross my arms frequently as well. I dont talk to people much. Those that know me know I am very friendly, nice, caring, etc. I am just very quiet and closed off to most of the world. I cant tell you how many people say "You dont talk much" to me and I simply respond "Nope".
Take what I say with a grain of salt, because that's all it is compared to the ocean of complexity when it comes to actions and real life.