I would also look into going to the library, or invest in a book called "Understanding Exposure" by Bryan Peterson. That book made the world of difference to me in how to get a creative exposure instead of just looking to get a correct exposure.
If I were to say find one thing to focus on next it would be understand your Aperture and what it does. By using f14, you will get what I believe is called difraction in your images. It is basically adding blur to your image. Every lens has a sweet spot that once you go beyond it, then you start getting softer as you go higher on the F number. I have found I rarely ever go beyond F11. But most of my photos for small groups is in the 5.6 to 6.3 range. I am usually using my 70-200 so I am back about 10-15 feet and it gives me about depth of field to get everyone in focus. If you have doubts, user AV mode and set your ISO to Auto and play with your camera and adjust your aperture up and down and get a feel for what each aperture leaves in focus. Just make sure to keep an eye on your shutter speed and make sure it stays at least a little bit faster than your focal length. Since your camera is a crop camera, technically you would want to try to stay 1.6 X your focal distance in speed. (And example is if you are a 100mm you would want to be at 1/160th or better) That might help with getting sharper images as your original shutter speed might have introduced motion blur.
Please keep shooting as each shot will help you get a better understanding of what you are doing. Everyone here, for the most part, has been nothing but helpful in trying to help me get better the last couple of years. I would not be the same photographer without the help that others here have given me.
Please let me know if anything I said here does not make sense.