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Long finger will be an asset once they start obeying your brain. Takes time. Also there’s so many ways to play the G chord. I remember early on I had could not play a clean G and when I finally got it I realized now I have to learn all these other G shapes that I have no command of. The one I use most now is a 3 finger shape:
ring on high E3, pinky on low E3 and middle on A2, it’s known as Folk G and Tony will use it a lot in the TAC program. It’s useful because you have quick and easy transitions from other open shapes: C, E, Em, Am etc.
It’s very common to struggle with some of these shapes in the beginning. I trouble with G, C, D, even the E. Slowly you improve on this one and that one. You should practice transitioning between chords as soon as possible. That’s how music is made so make those chord changes. Getting the chord to ring clean is only a part of the picture, you have to be able to get there from other chords.