I am addicted to masturbation will it have any negative effect on me? and how many times should one masturbate in a week?

Nothing specific: To the extent someone does this to excess it can take up time better spent on developing a more productive relationships with others. Most of the "bad effects" you hear about are just myths promoted by those who find the practice disgusting.

Good health: Agree with Dr. F. There are no negative effects from masturbation other than it being a manifestation of your thought process. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Get HPV vaccine. Wish you good health!