Roman 8:29

 For whom He foreknew, He also predestined to be conformed to the image of His Son, that He might be the firstborn among many brethren. (Romans 8:29)

God has already made the decision. You WILL be like Jesus! It may take awhile -- but God has plenty of time.  Surely this doesn't mean an identical physical appearance, but perfection. Perfection morally, spiritually  and yes, even physically and mentally. So don't be discouraged with where you are now. God is still at
work and He is no quitter. Being confident of this very thing, that He who has begun a good work in you will complete it until the day of Jesus Christ; How is God doing this? Primarily through His Word. So, stay in
the Word. The more you expose yourself to the accurate Word of God, the more you will be changed into the likeness of Jesus Christ.