My CPU is underperforming

[jeremy.hh]

So I've had some issues with my CPU in the past which I mostly solved. Now, because I felt like my CPU is better than it performs, I made a benchmark on www.userbenchmark.com and it turns out that my CPU (i5-7600K) is "performing way below expectations". The average performance benchmark is 93%, mine was 57.7%
I built my PC with the same CPU in May 2017. Is it common that this CPU doesn't age well? Or could it be a problem with the fan or some settings?
Should I buy a new CPU?

 

[volkgren]

Show us the link to your results. Most people overclock their CPU and then run that test and then it averages all the results. So if your's isn't overclocked it may appear to be running below expectations.

 

[geofelt]

You are comparing against other 7600K processors which mostly will have been overclocked.
How well you can oc will be determined by your luck in getting a good chip.
As of 6/19/17
What percent of samples can get an overclock
at a vcore around 1.4v.
I5-7600K
4.9 72%
5.0 52%
5.1 27%
5.2 16%
5.3 samples exist, unknown % of occurrence