nihilism makes sense

If you are fond of reading scriptures or sacred books, then one thing will surely make you take notice - the insistence on the transience of all the worldly things, how all things are going to end one day, how nothing is permanent. It is so easy to read them but how many of us have really experienced it? I have been reading books for a long time now and one excerpt from "Zen and the art of motorcycle maintenance" had really jumped out of the book and taken hold of me. It is related to the experience that the protaganist had when he was living a life of seclusion. The undercurrent is that of utter loneliness, of standing on top of a cliff and seeing nothing around, of having no one to talk to or to share things with. I could relate to it but I had never felt that way. I had felt lonely but it was not a despairing kind of loneliness. And I always wondered on how the author might have felt at that moment. Was it depression? Was it desperation to attach himself to something living?
And then while watching the movie "Crouching tiger, hidden dragon", I heard the warrior who had just returned from a session of meditation from the mountains who said the same thing " it was so lonely. I didn't feel blissful. I felt sad, an infinite amount of sadness. i couldn't take it".
Some days back, I had the same experience. I was standing behind the office taking my usual break, when it suddenly hit me. All human beings are so lonely, lost in their lives, in their thoughts but really drifting here and there, not only in physical world but also in thoughts, never being in this moment, learning to live in past memories or in future plans. There is nothing beyond this life. Death is not just a beginning. it is the end. There is nothing like heaven or hell or an eternal life or deliverance or any such bullshit. There is nothing, just a void. nothing to hide behind, nothing to look forward to, nothing really to focus your energy on. At that point, i felt a sadness well inside me and it shook me. I at first thought that I have gone into depression and I tried hard to shake this sadness off me. But I couldn't. My thoughts keep on returning to this feeling. Now I am reading about nihilism. May be the philosophy would make some sense to me.