I am 18 yrs old I am masterbating since 14 yrs i wanted to know does masterbation have side effects?

I will assume you mean "masterbating".

And I will assume you are asking if there are any side effects or negative effects (because, it is obvious there are "effects" - why else would people do it?? The "effect" would be to reach orgasm.)

There are a few questions already here on AB that may help you:

http://www.answerbag.com/q_view/447918

http://www.answerbag.com/q_view/471510

http://www.answerbag.com/q_view/353472

http://www.answerbag.com/q_view/154577

http://www.answerbag.com/q_view/640180

http://www.answerbag.com/q_view/560535

Yes.. Physically.. depending on how often you do it. It could lower your sperm count making it harder to...WElllll nevermind just saw your vickyy name... Yes for you also though if you are using a vibrating device it will actually toughen up your clitoris area. I have been with a few women whou i had a hard time satisfying because all they had done was play with mechanical devics.. They weren't near as sensitive and in general it was a pain in the ass... I don't receive until i've given. I have no viagra and usually can't last as long as them... Well unless i'm thinking about grandma's spaghetti.. but that's another thread...

It starves your brain of Oxygen and affects your spelling...

when i met my bf he was a virgin when we had sex for the first time he came now he never does he always masturbates after sex, i worry as one day we might get married and if he never cums how are we suppose to have children. can to much masturbation stop u cumming when having sex

Uh, it makes you feel good?

Side effects:

The church will tell you that you could go blind.

This is bullshit. Enjoy yourself!!!!

um, could you count an orgasm as a side effect? lol
no real bad side effects, maybe could lower your sperm count but you keep building that stuff up forever, so at your age i wouldnt worry. :)
keep at it!