About 2 years ago i was studying for an exam and felt really pressured ..help?

and for some reason i started pullin the fibers from my blanket and started rubbing my tumb and my index finger making small balls ...durring the day i don't do it but as soon as i lie down to watch tv or sleep i start doing it and also i like feeling the fibers in my quilt and can't stop ...some days i go to the bathroom and catch myself with like rubbing my fingers with the fiber and don't realize it....is this a habit? my mother says i should visit a shrink and think i'm doing it on purpose...sorry if i made some spelling mistake..my native languige isn't english..