The Church goes through a very thorough process of discernment before considering someone a saint. The case is studied, then the person is beatified and finally canonisation takes place. Before a person becomes a saint, they may receive the title of Venerable or Blessed.
It has taken even centuries for the Church to give someone the title of saint.
However, every one is called to be a saint
since the Lord says
So we are all invited to become saints in this life.
Work of God Apostolate
The Saints >>