You are quite normal for your young age, and you are probably trying to rush. Just take it easy and slowly, and try to enjoy yourself for at least half an hour or so without thinking about orgasm or ejaculation. Just focus on all the beautiful sensations as they begin to build little by little in your penis and throughout your whole body. Don’t be eager for a grand finale; just enjoy the ride and don’t rush. You can enjoy yourself in this manner for as long as you like, and you may even decide to wind down without spending yourself so you can enjoy your next ride even more. Believe me, it just gets better and better! So relax and enjoy; you have much to look forward to.
Also, if you have any feelings of guilt regarding enjoying your body, this will certainly impede pleasurable sensations. If this is so, search the internet for “boysunderattack” and there you will find some exceedingly good news that I wish I had known when I was younger!