What's holding you back? What is keeping you from giving of yourself to God today? Not enough time? Do you say to yourself, "I'll consider doing that later, when I retire and have more time."
It seems that we are afraid that if we take on something for God that He will lay on us a heavy burden, one that we just cannot bear right now.
But Jesus never asks of us or gives us more than He knows we can handle. He tells us to take His yoke upon us. "For my yoke is easy, and my burden light." (Mt 11:30)
We probably never really think about a yoke these days. But in the time of Jesus, a yoke was a familiar object. It is a wooden beam that is used to pair a couple of oxen together to allow them to pull a load. Of course, Jesus is speaking metaphorically here in the Gospel of Matthew. The etymology of the word "yoke" comes from the verb to 'join' or 'unite'. What Jesus is asking of us is to submit to Him and to be connected or united to him as with a yoke.
So what are you waiting for? Start today. Give yourself to Him. Consider spending time with Jesus today in prayer, in love, in service to someone or to His Church.