Orgasm frustration

So when I masterbate ( I have been doing it for 3 years now ) I can't orgasm and it's getting to the point where I just can't enjoy it anymore because I can't achieve it. I just lose interest all of a sudden without a massive emount of pleasure. I'm 15 and would love to know what I can do to enjoy myself more when masterbating and what I could do to potentially orgasm or even squirt.