How old are you? Why is this bothering you? I suppose I'd say that it is totally normal and our age has alot to do with it. When I was a teenager/young adult it was at least daily and sometimes 2 - 3 times a day. It bothered me for a while and I tried to stop. Couldn't...but I did cut down some. A couple of suggestions might be to add a hobby or exercise routine. Each time you get the urge, rather than do it, get into your hobby or exercise. Hopefully this helps, but please don't think you're abnormal or masturbate too much....your body will let you know when enough is enough.
Short of having a partner with whom you can have sexual release there is little that you can do to stop the natural urge to attain release.
While having hobbies, keeping busy, having friends to go out with, etc certainly will help limit the time you have to masturbate they don't replace the basic sexual urges we all have.
As you get older and have a partner the need will diminish somewhat but I think you will find that you will continue to masturbate albeit less frequently.
My advice is go ahead and do it,as you get older things will change. I'm old enough to remember Pearl Harbor, back then about 2 or 3 times a day, now about 3 times a week.
tips on less masturbation? 
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