Well, one of the quickest ways to describe my beliefs is to say that I'm a humanist. That's not a very helpful description, though, as humanism is not defined the same way by everyone. A good summary of humanist beliefs can be found via this position essay and list of definitions (with more material available here). There are other sites about humanism, but I don't agree with everything they say. I've included those links so you can see the broad range of opinion on this if you want to.
Here's something I say often, and it also encapsulates my beliefs pretty well:
Please don't think that this means that I want to change everything about the world (I certainly don't). What I really mean is that when one sees something wrong or problematic, one should try to improve the situation. One should not be discouraged because it seems difficult to change things, or because one thinks one cannot effect the necessary change. In particular, we should not give up on trying to change things just because it doesn't always work or because it takes a really really long time. Furthermore, very small efforts often have big payoffs in changing our immediate environs.
Part of changing the world is changing myself. I'm always trying to improve in various ways, and for obvious reasons I would rather not list most of them here! There are two I'll tell you, though: I'm always trying to work more efficiently and effectively, and I work very hard in ballet class to improve my technique.
Anne Frank said, "How wonderful it is that nobody need wait a single moment before starting to improve the world."
I think that's enough.