Anyone can be a graphics designer.
As to whether you can get a job and/or make a career in it is an entirely different matter.
There is lots more to graphic design that just be able to draw or being a cartoonist. Perhaps you need to research the area better.
Plus, you also didn't specify where you want to be a graphic designer?
web pages, computer games, shop windows, tile maker, kitchen designer, fashion, etc, etc, etc.
All of these require specialist skills for their area.