I want to marry my girlfriend and i made Istikhara

I want 2 get married with my girlfriend.i have no sexual relations with her.we just kissed each other twice.After telling ma family i did istikhara nd saw a dream i want 2 check about that dream.‘i sawthat ma elder sister she brought a new car in ma house which is black in color. nd let me tell u that we already have 3 new  cars in our house out of which 1 is in ma father’s use other one is in my use nd the third 1 no body is using 2 much..nd also ma sister doesnt drive but still she brought the 4th one.i asked her that y u brought the car as one extra car iz already here but she said that i liked it thats y i brought it.i knew that ma father will bcom angryy dats y i went 2 told himm in different way.i said dad honda iz a very nice car nd i like it we must have a car like that bla bla nd bla.at last he iz 50% convinced .nd said ok we will see.after that he came 2 de garage nd saw the car nd said ok nd he showed no feeling.kindly tell me about the dream of this istikhara