I'm having a hard time understanding your question.
Is it normaly to be sensitive and anybad thing that happends makes u never forget it.. and become so sad its sickning
I'm guessing that you're asking if it's normal to be sensitive? Well, if you you're a sensitive person, then yes, that's normal for you.
The next part I can't decode.
I'm guessing that when things happen to you, you can't let them go, and you obsess about them to the point where you're always sad about them. Is that what you're trying to say?
If so, have you considered professional help in the form of counseling?
Aren't you still grounded? Why are you allowed on the computer when you're grounded? You're posting a lot. I'm a parent. When my kids are grounded (which you've mentioned in many of your posts) the computer is off limits. Why are you allowed to use the computer while you're grounded?