You'll do better when you hit puberty.
You'll do much better when your older, but for now, some advice:
When you have a feeling you want to express in a flash (or any other media for that matter), make the flash to illustrate the feeling, not the events which made you feel it. For example, instead of showing a boy with a sad face and a paragraph explaining how he got it, animate a girl literally reaching into his chest and pulling his heart out. Or, to be less morbid, simply animate his heart ripping in two.