So what are the reasons for our loneliness?

I am trying to figure mine out...i mean i can see how i want humane contact, i ask people out and after sometime I don't want them. I find them either depressive, shallow, gossiping...I struggle to be my true self around others. I am not perfect either. And I am not thinking i am any superior...or am I thinking that? I find it hard to connect. It shouldn't be this way, we are supposed to be sharing our lives ❤️ I, we, shouldn't be living them alone..