Why are all my games performing so bad?

Complete newbie to PCs, I have been having issues with my PC not being able to run most games, when playing games like Assetto Corsa or Arc survival evolved, a message pops up saying the CPU is exceeding 99% followed by a frozen screen with around 1 frame per 7 seconds of movement, or the games just dont load. The menus of the games, however work just fine.

I've tried changing up the graphics settings and framerate limits in game, but no matter what I do nothing seems to change.

My GPU is an ' Intel i7-900F ' and my graphics card is an NVIDIA GeForce RTX 2070. Is it just a shitty choice of hardware? Or is there some sort of setting that could be stuffing up my PCs performance?