The "I have small hands" idea
Instruments- discuss specific features, luthiers, instrument problems & questions
I think the point of the original post was not to give up and think you can't do something, but to accept that you might not be able to do it "yet." That is certainly good advice.
I've told this story before, but when I was first starting on the dulcimer I bought some tab from Tull Glazener to learn a song I had always loved, but there were some chords in the very beginning that I just could not play. It seemed I could not force my fingers into those shapes. I got frustrated, tossed the tab up in the air and walked away. I didn't give up on the dulcimer, but I just gave up on playing that song. About 6 or 8 months later I was cleaning up a bit and moved a book case to clean behind it. A piece of paper had fallen there, and I picked it up to see that it was the tab I had tossed in frustration. I sat down to try to remember what it was about the song that I was unable to play, and you know what? I was able to do it! What had once seemed impossible was, some time later and with no conscious effort, now fully do-able. I'm so glad I didn't decide initially that I couldn't play the dulcimer or couldn't play chords or whatever.
So if you find a technique or a chord beyond your abilities now, don't fret ( ). Just keep playing and you'll see that over time your skills (and the muscles in your fingers) will develop and you'll improve. It might take a while, so be patient and find joy in what you are capable of playing even while you hope one day to be able to play more challenging stuff. About five years ago I realized that my pinky was really weak and near useless. So I developed some exercises and some songs that emphasized the pinky. I worked on that stuff regularly, but it took a long while. About two years later I was playing a tune and realized that my pinky had become just as strong as my other fingers. I now find chording fairly easy and natural, but it was certainly not that way at the beginning.
If you join a gym with the goal of running 5 miles on a treadmill, you wouldn't decide on your first day that because you tired out after 1/2 mile you were incapable of running 5. You would understand that it takes time to develop the skills and abilities to reach your goal. The same is true of playing music.
The real trick, I think, is to avoid letting the frustration overwhelm the joy we get from playing music. Learn to play the simple stuff well, even if you still have ambitions to play more challenging material.