The benchmark suggests your HDD and CPU are performing below expectations. The RAM and GFX look fine. Your CPU and GFX are pretty well matched, so normally there shouldn't be a CPU problem. It could be one of a few things:
1) Your HDD could be bottlenecking the system and creating more work for the CPU
1.a) This might be the HDD itself just being too slow for the setup;
1.b) Or it might be that the 8GB of RAM is causing more swapfile work on the HDD and CPU
1.c) Or it might be a driver / software config issue
First, ensure you don't have excessive programs, apps, processes and services running in the background on system boot. Ideally you want no more than 2GB RAM used after boot (on Windows 7 here, and use 1GB of RAM at boot). I recommend CCLeaner for selecting boot processes, scheduled tasks and so on. It's also good for a general system cleanup. Also consider an HDD defrag. It can't hurt.
If that seems fine, look at your swapfile settings. Given your 8GB of RAM, I would suggest a manually set minimum swapfile size of 512MB and a maximum of 8192MB. This should reduce disk thrashing from swapfile resizing (if indeed it's actually happening).
Try running the benchmark again after all that. See if anything's looking better. It might not make any difference though. These things are trial and error.
Lastly, I recommend you get yourself an SSD (500GB minimum), such as a Samsung 850 Evo or Crucial MX500 and get your system booting and running from that. The overall performance gains should be very noticeable. If you can justify a 1TB SSD and do an installation migration, even better, but 1TB drives are less economical in cost per GB.
While extra RAM might help in some ways, there's no reason why 8GB shouldn't be enough. Fortnite can be RAM hungry though, so I recommend you deal with your system-used RAM.
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