CorsairSSC :
Yes, it probably is the driver issue. This happens on all new builds. However, have you made sure your display cable is connected to the motherboard? If so, it should be connected to the GPU.
Dunlop0078 :
No the gpu does not need drivers to boot up and display something on screen. Your specs might help. Are you plugging your display cable into the back of the gpu and not the motherboard? Have you connected the pcie power cables to the gpu from the psu if it needs any?
GamesOn :
This is how you do it.
Put in the GPU in your motherboard > display cable plugged in GPU ports and the other end to monitor > start PC and install drivers.
Download the latest drivers. You don't need drivers for GPU to give display, but for the GPU to perform, you need drivers.
Thank you all very much, I figured it out myself short after, but thank you for your input and yes, you were correct. Short after I figured out myself that I had to plug the display cable into the GPU and not the motherboard and it went from 14-20 fps in a benchmark to 110-230! I feel so stupid honestly, although it's my first time building a PC, I still feel so stupid for not releasing it.
PS: If anyone still wants the specs, here:
i-7 6700k
Gigabyte 1060 xtreme gaming 6gb
Asus Z170 Pro Gaming
1TB WD blue 7,200 rpm, 3,5 inch
TX3 evo
2x8gb HyperX 2133MHz (although one of the RAM is dead straight from the box :/ )
Windows 10 64 bit
Fractal Design Define R5
EVGA 500w (Dont question my choice here, I am not planning on overclocking and it's enough)