Are these signs of anything? Physiological ?

Sounds like you are caught in the stage of self identification and you are trying to find your place in this world. Don't think of it as odd but an exploration for your likes and dislikes, and what you find interesting in life. Its all part of growing up and getting older- when you figure out who the heck you are and who you want to be in life. Its normal, don't sweat it. If it really concerns you then perhaps talk to the school counsellor for a second opinion