STATS, being short doesn't limit your chances to pitch if you throw hard enough and have stuff.
Of course scouts will project a taller pitcher to throw harder than a shorter pitcher, there's no doubt about that. But the old arguments that shorter pitchers can't throw hard, break down more, or get hit because of flat fastballs is pure nonsense. Show me the stats.. they don't exist. They hit my kid at a .202 clip this summer.
There is a valid argument that a taller pitcher should be able to release closer to the plate, but many shorter pitchers negate that with a longer stride. I know my son does.
So that leaves the fastball. Do you got it or not?
If any parent of a shorter pitcher is worried about this stuff I can only suggest to you I've been there done that and it isn't worth your time worrying about it. Focus on the fastball and it all is meaningless.