I have the same PC specs as my buddy but jerky with me?

I have a
rx 5600xt
ryzen 5 2600x
1Tb hard drive
Asrock B450 per 4

With my buddy, Fortnite runs without stutters but somehow with me you already have ideas why
I've already tried resetting Windows…
I only have slower ram of my 8gb 2400mhz its 3000mhz

Same settings?

Do you have exactly the same specs? Without exception?
Ryzen CPUs benefit from fast RAM, maybe that's the problem.

Or something is going on in the background with you, which ensures that

So even with worse specs it shouldn't jerk. Have already checked for errors (believes in the launcher). Or try turning down all the settings and see if it still jerks. Is FPS dropps jerky?

Maybe it's because of the Wi-Fi?

Yes

Jap in the air

Maybe the RAM is different or not good enough? Maybe there are no cables or something is not connected securely? Maybe it's also due to the game, the servers, or the monitor?

Internet is good for you too? And well, maybe it's really RAM. Is your RAM running in the dual channel? His Villeicht already and not yours.

It's not mine but mine is slower