Yes, you are directly aware of what blue is to you but I can only know this indirectly and partially from what you tell me. For example, you might say that blue is a relaxing and retreating colour and this may give me some idea of what it is like for you.
I don't think that this is all just meaningless philosophy so I hope it's not off-topic. It illustrates that we have our own subjectivity and also that this subjectivity is not isolated and cut off from everything else. We each see blue in our own way and in a way that only we can really know but we also need real things in the real world such as the sky in order to have this experience. So the general point is that we all have an awareness of the world but we each form our own perspective on that world.