No, it's not a bad habit. It's normal to masturbate, and people do it, so you shouldn't feel weird or abnormal if you're doing it. It's fine to do it every day, since it actually has health benefits, including boosting your immunity, relieving anxiety and stress, plus it's THE safest sex that there is, since obviously there's no risk of an unwanted pregnancy and you can't give yourself any STDs.
The only time it causes an issue is if you develop an addiction to it, to the point when you're hurting yourself, or you're unable to engage in your usual daily activities.
Hope this helps.