sorry,but i have to be brutaly honest.
you dont have athletic talent.you are young enough to excel in some other fields other than sports.
maybe you are better suited for endurance sports like marathon running,cycling,triathlon,long distance swimming,etc.best of luck!
This guy is stupid. You are only 14, to say you have no athletic talent is ridiculous. Over the next 4 years (I’m only 18 so I don’t know beyond this age) you will change so much. Speed will come. I don’t think 14-15 seconds is that slow for a 14 year old. I don’t remember who, but someone said the 40 yard dash is a lot different than the 100m. A top speed sprint is purely plyometric while the 40 yard dash is more of a combination of speed/strength. He is right, first priority is form and don’t neglect warm-up or stretching. If you aren’t running right you’re going to get problems.