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Guitar necks are manufactured with different width sizes. When I first started, I was using my husband’s guitar and it had a 2-inch neck. It wasn’t happening for me, so I purchased a youth guitar with a smaller neck width. It does make a difference. Since you’re a beginner, try to do simpler G chord and then build up to the one that Tony uses. The best thing is finger exercises and practice. You’ll find that the G chord will be easy as time goes on. The chords that will take months in getting will be the C & F chords (especially Barre). Short fingers and Barre chords are a nightmare so fair warning and don’t get frustrated – it seems to be a rite of passage with those chords. Luckily, there are work around until the fingers retain the muscle memory. Good luck!