The 9mm is good for a light powered round. To offset it's lackluster ballistics, make sure you load it with high quality defensive ammo: Winchester Silvertips or Ranger Ts (Black Talons), Federal Hi-Shocks or Hydra-Shocks, Glaser Safety Slugs, and Speer Gold Dots are all good dependable rounds. Test them out, see which fire the best for you and which feed without jamming or stove piping. Keep your wrist stiff.I have 2 guns that I have been training with the past few months before I took my test they are RM380 and 38 Special.
I tested with the instructors 9mm, loved the way it felt in my hands so got the new Springfield 9mm after testing and took it to the range last night( love this gun) So the 9mm will be the gun I will carry, and the others will be in strategic places in my home just in case.
I like the 9mm for target shooting. I have a very expensive 9mm that only comes out of my safe maybe once every three years, because it is a very rare pistol.
As you get more proficient and comfortable with shooting, I recommend you move up the power scale to a .40 S&W or .45 ACP for your primary carry. Women do exceptionally well with any of the Colt 1911 .45 clones. Way better than me. I can't shoot that pistol to save my life.