If your a lost sheep that means you have not been born again yet.

Something to understand is that Jesus spoke in parables so that people would not understand and be saved. Jesus came for his elect not the goats.

Mark 4:11
And he said to them, You* have been given to know the mystery of the kingdom of God, but to those who are outside, all things happen in parables;

Mark 4:12
in order that seeing, they may see and yet may not know, and hearing, they may hear and yet may not understand; lest they should turn again and their sins might be forgiven them.