If I want to stream Fortnite, is my game, can I fix it or is my PC too bad?
I do not know how good your PC is, neither am I an expert but the data would definitely help the others.
If it does not have enough Internet "Power" (mb upload / download)
to gamble and stream at the same time.
If it is jerky then your PC is too weak…
What kind of system do you have?
Nen toaster?
It jerky, can you do anything there?
Well then a new CPU with motherboard and RAM
Well adjust graphic settings: From high to medium or adjust the stream resolution…
Look in the Task Manager when your graphics card is overloaded