Why not be happy with what I have already?

Having read a story of how a blind man can create his own beautiful world…. I thought to myself, why can’t I also be happy with what I have already? I know life is hard when we feel a lone or not have a partner or friends, but why can’t we just be happy with what we got? Why can’t we work and do things in life with happiness? When was the last time I can wake up to be happy the sun is out, be happy the warm water I have to wash my face and the happiness of seeing people around me still a live? Time is precious, no point of being sad of worldly things we don’t have but happy with things we already got?