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Welcome to the TAC community!
What you outline is a common issue. Most can’t reach their pinky out. There are stretches you can do, but you’ve received great advice. Lift your hand up to reach the fret with your pinky, or consider a short scale guitar that makes it easier on those that might have a similar issue, arthritis, smaller stature, etc. Be kind to yourself, don’t fret too much (play on words there), do the best you can, without hurting yourself, and remember that as you continue to play, your finger span will become more agile and you’ll be able to stretch further in a year than now, and so on. Make sure you are warming and loosening up before trying any stretches that are difficult.