My gta is stuck on the loading screen
Why when i put script hook v on my gta v folder it's stuck on the loading screen
Scripthookv does not itself cause you to get stuck on the loading screens. It does however give you a license to install mods that will definitely hang your game.
You haven't provided details or information that might help so here's a good starting point.
If you want to ensure your installation is "mod ready" this can help.
If you're serious about understanding how mods work, this might be helpful.