Is it ok to masterbate every day ?

Yes. Masturbation: is only a problem when you do it too much (then it hurts or isn't pleasurable), or when you use it too much to not deal with other things, like bad moods, anxiety, etc. Masturbation is a personal thing, and so is the frequency. If it doesn't interfere with the rest of your life, enjoy.

Everyday: this is a personal and subjective condition. everyone is different. There is no health hazard to the quantity.