Agh, yeah, it's Barbarians not Fighters who can exceed 20 for their natural strength scores in 5E ... up to 24! Thanks for the correction. 24, isn't that like a Storm Giant? That just does not seem "natural" to me, but I guess there are the examples of Hercules and Sampson.
I was 4'11" once. I don't remember having too many problems with it, at the time. If I see someone who is really short trying to stuff their luggage in the overhead compartment on an airplane, I always let them give it a try for a couple seconds before I offer to help. I've seen some creative approaches such as the "bag toss" and the "chair climb". And if it doesn't work out, then there's nothing wrong with people working together for a good cause.