You are interested in sex, with a desire to get it out quickly and be savvy. But there's no need to rush into it just because your friends are doing it.
Just as everyone's height is different, so is everyone's savvy. You may feel jealous when you hear that you've done it, but don't worry, the time will come for you too.
You don't have to force yourself to go through with it. You never know when it will come, so be prepared for it.
There are two ways to have a spermarche.
When you get horny thinking about sex, your penis gets bigger and harder, and when you touch the bigger penis, it feels better and fluid (semen) comes out of the hole where you pee.
The second is called "Wet dreams" where semen comes out before you know it while you are sleeping. You don't know when this is going to happen, so when it does, don't panic. When you have Wet dreams, you will get semen on your pants, but don't leave it there, wash it with water immediately.
It is not a matter of becoming an adult by getting your semen out quickly, but by thinking about sex when you become familiar with it.