If u have a hood or a lens converter , try screwing it a little tighter , then unscrew the converter or hood , the filter will get loose and will be able to be removed .
It will be better if u to a camera shop and ask for assistance . :)
If u are a frequent photographer, I suggest u should purchase a new camera . And ur camera is already 3 yrs . U can also purchase the camera body and repair ur lens , if ur lens is still in a good condition .(: