In our minds, we make ourselves too big for everyone around us, we think that we are at the center of the world and everyone around us just doesn't matter, we engulf ourselves with small problems oneself faces every day, and those problems just keep on increasing, if you map these things in your mind we increase the size of our ego in our mind and then we just get lost in this huge space which we have built in our head, where even a very small thing which could be a size of tip of needle becomes a big football, now these balls just keep on hitting us in as many possible ways as we can think.
Due to all of this ego, your eyes get blind as you are now so much engrossed in yourself that you cannot see anyone else, you cannot see anyone's else problem, you cannot appreciate anyone around you, you lose the ability to love people around you then, which in a way secludes from people around you, you would not be able to connect to people now and your ego keeps on increasing and capturing more space in your mind now.
How to stop that?
One simple answer - Meditate
Just give a pause to your mind, see the world around you, feel the world around you, the ego which has been increasing in your mind is just like sponge if you keep on thinking about yourself it keeps on absorbing more from you and keep getting bigger, once you meditate it release and reduces in size, now it's not going to reduce in a day but reduces a bit, and if you keep meditating every day it would keep on reducing in size, and once you have space in your mind of others, then you can start connecting with people more, start loving and start appreciating people around yourself.
Peace