Everything is subjective. Absolutely everything. It cannot be proven otherwise. Everything in the world is perceived through your own senses that are unique to you, and are then filtered through your experience and knowledge which are also unique to you. This means that you perceive an event in a different way than someone else would. There are probably things that could be agreed upon, between different people, but the perceptions are not identical. Over time, these unique experiences build a person’s identity, which is applied to and revised by new unique experiences.
Of course, the fundamental problem with this is that it is based on circular logic. If this, and all other worldviews cannot be proven true, then you have to accept it before you can believe it. I found this conclusion through personal reflection, slowly building up to this complete idea.
Now, if everything is subjective, it is important to remember that we have control over how we perceive things – at least to an extent. This means that the world around us can be as interesting or uninteresting as we want it to be. It also means things can matter as much or as little as you will it to. When this is realized, you can really create the world as you wish it to be. Whether your goal remains to help other people see the world as you do or not is up to you. One thing that has to be remembered, is that this philosophy cannot be forced upon anyone, and they are probably better off going in the direction they see is right.