Okay, take the same argument then and follow it to "You must be born again before you are born again." It is said poorly. Theology needs careful sword work.Jesus told Nicodemus that he needed to be born again or else he would not enter into heaven, even though Jesus knew Nicodemus was already one of the elect.
3 Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God.
4 Nicodemus saith unto him, How can a man be born when he is old? can he enter the second time into his mother's womb, and be born?
5 Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God.
6 That which is born of the flesh is flesh; and that which is born of the Spirit is spirit.
7 Marvel not that I said unto thee, Ye must be born again.
As far as your reasoning, I may agree: Nobody can 'born nor born-again themselves.' Nicodemus knew that he couldn't do this by himself when he makes the suggestion. Jesus' reply shows that it is God the Spirit that makes people who are born-again Spiritually, born of God.
Still today, there are those in our churches and outside of them, that are following God in the flesh, without Spirit.