I'm seventeen, already hit puberty a long time ago, and I constantly keep an eye on the ladies at my highschool. Problem is I cant control myself sexually. I'm single currently, and I always have the urge to "give myself sexual gratification". On average maybe 4 or 5 times a day. Is this healthy? Am I going to become a nymphomaniac?
Masturbation at your age is perfectly natural no matter how many times a day you do it - your penis will tell you if it is too much, though whether you then take notice is another matter! You are a horny young thing, and with all the temptation around you looking after yourself is normal.
The only thing it may interupt is your normal social life - if you are too busy masturbating you will not have time to get a girl friend, where your sexual energy could be directed to much more satisfaction.
One other point, it is an addictive circle (i am not saying this is bad though) so the more you do it the more you want to do it!
When you are older you will be able to be more relaxed and will not have quite the same drive, but you need to get to that point. But again, let me say it is is perfectly normal.