Why don't i orgasm like the first time?

hello, im a lad aged 14. i first masturbated 2 years ago, and when i did that my whole body stiffened, my private area throbbed and it just felt so good. i was paralyzed for at least five minutes on my body, like that. but after that, the sensation faded each time i did it (like 3 times after). i probably do it everyday, and the closest i've came to a great feeling was the release, and that wasn't as good. why can't i orgasm like before? i've tried waiting ( i did for 2 weeks) and nothing really changed, advise please :)