Ok....So When i play like 3 or more strings.. i get a rattling sound from the strings

is something wrong? or is that normal in guitars?
Define "rattling sound", we need more information.
R.I.P. My Signature. Lost to us in the great Signature Massacre of 2014.

Quote by Master Foo
“A man who mistakes secrets for knowledge is like a man who, seeking light, hugs a candle so closely that he smothers it and burns his hand.”

Quote by Zaphod_Beeblebr
Define "rattling sound", we need more information.

As in either the strings are loose, or that i'm smacking something
quite hard to explain through writing
Does this happen with every guitar you play?Maybe you're hitting the neck(pick position) or ram the strings too hard?
I had a friends guitar where the tuner rattled whenever you played the D string open... sounds tacky, but in the short-term, I stuck some blue-tack on it and it was problem solved.

Either that, or the strings are loose, or maybe your action needs adjusting.