Am I developing Nicotine Addiction w/o even smoking?

Studies have found that people can get addicted to second hand smoke and it sounds like that's happened to you. Since you're already in effect a smoker and presumably have been for some time, there's not much you can or have to do at this point, after all these years your addiction won't get worse. Then, when you're old enough to move out, you can try to go without nicotine -- if you can avoid the temptation to smoke yourself the withdrawal symptoms will fade.