How to repent for real

Romans something states that "it is the kindness of God that leads men to repentance."

This is true. You cannot properly repent unless you know how kind and good and loving God is. Otherwise your "repentance" will be full of all kinds of other sin anyway, like fear, and mistrust, which can lead to insincerity, and dishonesty.

David knew how to repent so well because he was so in love with God, the one whom he was repenting to.

Repentance, like everything else of God, works only through love.