Student or Learner
Okay..here it is. There was a gang fight happened at my house area. They had destroyed/spoiled/damaged( please tell me which word to use) 5 cars at my house area. Those cars' owners are not related in the case. They are just innocent people. All windows had broken. When I going to tell my girlfriend about it (I'm a Chinese Education/educated and she is an English education/educated, so we communicate with English) I don't know how to tell her.
Me: You know what? There was a gang fight at my area last night.
She: Tell me about it.
Me: Urm.... Bunch of Indian guys...broken...few innocent people cars windows.
My girlfriend knows me well so she can understand what I'm trying to say. I feel embarrassed, I want to improve my English level.. So please, tell me.
If she's your girlfriend, there should be no reason to be embarrassed. She knows you're not a native English speaker and I think you can fully expect her to either ignore your errors, or correct them nicely. However, my suggestions are above in red (to both the conversation and to your post).
Please remember that one full stop is sufficient at the end of a sentence. You connect far too many parts of sentences with " ... " and it is not appropriate.
PS - In your title, you used "I got blanked". This is a rather informal term for "I was ignored". I think you meant "I go blank" meaning "I cannot think of the right words".
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.