Point?

So what is the point of trying to be truly virtuous if the only way to do so it to be able to define it, which is something I cannot do? Am I doomed to be labeled ignorant because I cannot definite retrictions to an abstract idea? Sure thinking and questioning about virtue is important for us to even begin to grasp our humanity. But why go any further? Because considering each man has his own philosophy then how are we to ever agree on an accepted "universal truth". There were many things that I thought to be accepted universal virtues,but thencoming to college has made me rethink all my beliefs. And I am not sure about myself anymore. Thinking about this is making me feel like life has no meaning, so i will stop this senseless babbling.