You've often heard, there's something wrong with your generation. Is it because you live in a world where people derive strength from being cold and distant? Or is it because there's this need to protect your heart?
You have grown to believe that people out there are trying to hurt you.
You build walls, and when someone manages to climb up or knocks, you refuse to even look out the window and tell them you're not coming. You want to leave them anticipating something you don't plan on doing ever. You think you're being safe. You don't trust them enough to welcome them inside, but you fail to realise that in doing that, you're probably damaging them too. Essentially the ones waiting at your door. They might end up with trust issues because you are scared to even give them a chance.
Don't you think they're probably scared too, of tiring themselves out climbing the walls that shouldn't have been there in the first place? Maybe it will turn out to be a reason for them to build their own walls and just not make all that effort again, for anyone.
So think, if it's really worth protecting yourself at the expense of all others when there's a fairly high chance that you still might be hurt at some point in your life? If there's a point in becoming so hard that there comes a day where you could fall and break completely? Why not stay soft so that even if you do fall (which you eventually will one day) you don't crumble. Why not live in a way where you could just allow people in and let them decide if they're willing to stay. Not everyone wants to destroy you and at the end of the day, maybe isolation is not safety, but it sure could be death.