I Want To Quit My Job !?

Quitting is no problem, you might want to give your employers a few days notice but just tell them that the work is too hard and you want out. It would probably be wise to try to line up another job before you blow this one off but that is up to you. I think you should also keep in mind that at your age and skill level most of the jobs that are available will be pretty crappy so you will probably be trading one bad job for another.