Is it bad if i masturbate for twice a week but i don't eat well i mean healthy food ?..

You & everybody else: Ur almost a man, and what u do by yourself teaches u about ur mind & body in preparation for adult life & keeps u comfortable and focused. Sounds like there's no obsession or risk of problems. If dad's a reasonable guy, maybe u can talk with him. Try to avoid buying food that's sugary / greasy / salty (we tend to overeat this), get plenty of protein & some fruits & vegetables.Good habits start now.

No, it isn't : It is normal to masturbate it is important to eat well balanced, regular meals, all the time.