Faith ... in God ... is a powerful force which is available to every Christian who spends time in worship, prayer and studying God's word. The Apostle Paul who grew from a religious fanatic into a faith full disciple and Apostle of Jesus Christ, did exactly that. He exposed himself to God's word and yielded himself to God's will, and thereby grew in grace and the knowledge of God. He became one of the greatest men who ever lived, wrote more than half of the books of the New Testament, as God gave them to him. "So then, faith cometh by hearing ... the word of God." Rom.10:1.
Jesus confirmed this attitude of faith is available to every Christian.
Considering these words and actions of Jesus ... and Paul, through Jesus .... Never say "I can't", unless God's word or His Holy Spirit tells your heart not to do a thing. Say with the Apostle Paul, "I can do this." But if you say it in faith, that faith will put you to preparing, analyzing, studying, planning goals and working with an almost obsessive, reasoned, confidence toward each of those goals.
Now here is a young lady of whom people said, "It is not possible" for her to be an athlete or to do a thousand other things ... but she did them all. So never quit, never stop trying, never give up on yourself accomplishing whatever is within God's will.... for you. RB