Im a 19 yr old boy i've been masturbating for the past 4yrs at least twice every week.can i have any effects from it?

Unlikely to be a pbm: Most in our culture will not willingly discuss the issue. However, this is normal activity in both sexes at a broad range of ages.It will not decrease your ability to have kids in the future.

Nope - go for it: Twice a week is... Less than many 19 year olds. Unless you're masturbating with sandpaper, you're should be in the clear. If you're hurting your penis doing it, use a lubricant which you can buy at any grocery store or pharmacy.