Reptenence is often associated with a changing of one's mind about sin, but not exlcusively. It really just means to change one's mind about anything. Scripture states God can repent (change His mind) and Jesus took the water baptism of repentence as well. Jesus changed his mind about living the life he wanted to live as a builder with Joseph to serve God in God's ministry instead. Unless, of course, you think Jesus only did a fake water baptism. It would seem that's the route you must chose.