I'm 17 years old guy. i masturbate 1ce or twice a week. is it normal?

Perfectly normal: Question lists you as 17-y-o, but dreznikov9 lists age as 42. In any case doing it 1ce or twice a week is a healthy release ; may also avoid noctural emissions/wet dreams. All normal boys do it, it is abnormal not to, unless you are sexually active, and even then it is normal. Don't let anyone try and convince you that it is abnormal to masturbate.