This is something a lot of people overlook. Most steel-string acoustic guitars have what's called dreadnought style bodies. These are big guitars, and if you're a small person they can be quite uncomfortable to play. When you sit down with the guitar in a normal playing position, you should be able to reach the soundhole easily, without having to stretch. If it's even a little uncomfortable, it will affect your playing.
People play best when they're relaxed and comfortable.
If the dreadnought body is a problem for you, consider a smaller guitar. Some guitar makers put controls in places where you might accidentally hit them while you're playing. Just because it sounds good to you when you play it doesn't mean it will sound good to your audience. If you like the sound, it sounds good. A flight case or hardshell case is best.