If we have to wait to see how we feel before we know if we can enjoy the day, then we are giving feelings control over us. But thankfully we have free will and can make decisions that are not based on feelings. If we are willing to make right choices regardless of how we feel, God will always be faithful to give us the strength to do so. Living the good life that God has made ready for us is based on our being obedient to His way of being and doing. He gives us the strength to do what is right, but we are the ones who must choose it... God won't do it for us.