Choices are usually based on interest, attractiveness, pleasure, wants or needs. We face these choices daily and we recognize that we are responsible for our choices. Sometimes we lose out on something good because our choice was not based on good reason but rather an excuse that proved to be non-productive.
When called by God we are free to respond. Our choice to respond or not to respond is totally up to us. God never pushes or demands from us. He is always a gentleman! He leaves us free to respond.
Hey, I DON'T THINK I AM HOLY ENOUGH, I AM NOT WORTHY. \
There seems to be a strange belief going around that anyone thinking of becoming a religious must be totally holy or worthy. The truth here is this: To say that one IS holy enough or worthy enough is a sure sign of the sin of Pride, the Original Sin that got us into trouble a long time ago! To focus on being holy or worthy enough is to miss the whole point of having a vocation.
In the Book of Genesis we read that God made us in His image and likeness. What is that image and likeness? It is love and holiness. We are holy people. Since any call from God is a gift, the excuse of not being holy or worthy enough simply falls short. At no time will anyone ever be holy or worthy enough. That is what makes this vocation a real gift.