I masterbate eight times on the average in a month. Is it too much?

8 times a month as an average is not excessive. That could be twice a week.

However if that 8 times is on just one day of the month, it might indicate a problem.

Masturbation can sometimes cause problems in your sex life, depending on how you do it, why you do it, and what is going on in your mind at the time.

However the frequency you mention is, in itself, not a problem.

 

I know boys who masturbates about 4 or 5 times in a day, It´s not a problem. Teens loves to masturbate. That´s a cool and safe way to get fun.