Friends Stop At A Point Where Nothing Too Personal Involves

I wonder why cant friends be as close as family... I do regards my close friends like own family members which is why I will show them my most true sefl, my temper, my emotion, my feeling without hiding at all, but apparently, friends are not the ones whom you should show all these. You can only show happiness, you can only share joy. What about sadness, upsetness? No, you cant, or you will be said as problematic. Friends only stop at a point where nothing too personal involves. Thats the friendship I get all the time, and I have to accept it because that how it is going along. No choice no choice.