Last night I had a very strange and scary dream.
I was walking with my bestfriend towards the parking he had placed his car in order to find a better place.It was night,around 9 PM. When we were approaching the car, I opened its front door and suddenly a pretty young kid (age of 8-9 years) ran towards me with a gun and shot me 6 times.First an my right arm,then a bullet just missing my head and after falling to the ground I got 4 other bullets in my back. Somewhere in the distance there was a gang smoking and laughing with what the kid was doing.
After that,the kid shot two times my bestfriend who fell over me. We were both lied on the ground and the kid left, while we were playing dead.
Then I woke up.

Here are links to the key symbols in your dream:

child: dreamdoctor.com/dream-dictionary/definitions/child.html
attacked: dreamdoctor.com/dream-dictionary/definitions/attacked.html
shot: dreamdoctor.com/dream-dictionary/definitions/shot.html
injury: dreamdoctor.com/dream-dictionary/definitions/injury.html

Given the presence of your best friend and the age of the others in the dream, it is likely to relate to a situation (present of past) involving your peers or your social group... who you feel might take some pleasure out of your hurt/injury.

Dreams are expressions of your feelings about your waking life at the time of the dream. Once you connect the dots between the meaning of the symbols and what's going on in your waking life, you will be able to protect yourself emotionally from such "attacks."

Hope that helps!