I do not understand this statement. You can play and you get better when you practice consistently. I have heard this personally.
The only context in which this could have meaning is if you are comparing yourself to others, which is understandable but should be avoided to the best of your ability.
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BTW, we all get frustrated. Music is hard. The ones who make it look easy are able to do that by countless hours behind the scenes (which is true of most skills), even if they don't tell you that. I recall Jeff Beck saying how much work and obsession goes into getting every note to sound a certain way.
Although some progress quicker than others, nobody is born knowing how how to play, or skate or hit a baseball. I think the thing that likely holds you back the most is the thought that you can't. Purge the thought and practice.
Now, I will say something I actually thought in the beginning of this thread....buy the guitar without hesitation IF you are willing to commit to practicing regularly. If so, it is a no brainer. If not, it is as good as sold already IMHO.