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Hello @MJV ,
@JohnV has already covered the most important points. Let me reiterate: your fingers must be arched. Hand and wrist position can help you do that by bringing the thumb farther down the back of the neck so your hand rolls up around the neck giving you greater reach. Now, one other thing of utmost importance, fret the string with the very tip of your finger, not the pad, but just shy of the nail.
One other thing, after years of playing, I can now play different finger positions when I play the G major chord, but when I started, I could only manage one. And that one is with the little finger on the 3rd fret of the high E, the ring finger on the 3rd fret of the low E, and the middle finger on the 2nd fret of the A string. The middle finger being the longest it has the most arch. Besides which, there are several other very good reasons for learning this as your basic, go to G chord, like G dominant 7 and G major 7, played with the index finger on the high E string.
Hope this helps.
MG 😀