Minimum specs for Fortnite:
Operating System: Windows 7/8/10 64-bit or Mac OSX Sierra*
Processor: Core i3 2.4 Ghz
Memory: 4 GB RAM
Video Card: Intel HD 4000
Your PC Specs:
Operating system: Im guessing Windows 7 or 10
Processor: Intel i3 2120 3.3Ghz
Memory: 2GB RAM
Video Card: GT 210
Conclusion:
Your processor is fine, although your RAM and GPU (video/graphics card) is very low.
You will be able to run Fortnite on low, but you will also have low framerate which will result in non-smooth gameplay and inability to perform well (as the game will be running so slowly, it will limit your ability to react to situations quickly).
Hope this helped!
-Lachlan