HaxCookies :
And also, I have read that if my CPU is on 100% on multiple games, then there certainly is a bottleneck
If the CPU is pretty much staying around 100% usage, while the GPU is unable to reach 100% usage, then yes... that could be CPU bottleneck. But there may be other factors causing the CPU to work overtime. Virus, malware. Ad-ware and bloatware can hog resources too.
But there is no way a i5-4670K should bottleneck the 1060 6GB if the system is in normal condition.
1) Have you run CCleaner recently?
https://www.piriform.com/ccleaner
2) Malwarebytes? https://www.malwarebytes.com/
3) Update your virus pgm's signatures and then run a FULL scan.