Dear Friend, thank for responding,but We humans can NOT ever become a true angel.
Saint Thomas Aquinas was an Angelic doctor on the history of angels.
here is a link to his writings.(you will need to scroll down to the Angel section)
http://www.newadvent.org/summa/1.htm
Excerpt:
Objection 6. Further, to beget offspring is a vital act. But this has befallen the angels in their assumed bodies; for it is related: "After the sons of God went in to the daughters of men, and they brought forth children, these are the mighty men of old, men of renown" (Genesis 6:4). Consequently the angels exercised vital functions in their assumed bodies.
Answer;
On the contrary, The bodies assumed by angels have no life, as was stated in the previous article (ad 3). Therefore they cannot exercise functions of life through assumed bodies.
I answer that, Some functions of living subjects have something in common with other operations; just as speech, which is the function of a living creature, agrees with other sounds of inanimate things, in so far as it is sound; and walking agrees with other movements, in so far as it is movement. Consequently vital functions can be performed in assumed bodies by the angels, as to that which is common in such operations; but not as to that which is special to living subjects; because, according to the Philosopher (De Somn. et Vig. i), "that which has the faculty has the action." Hence nothing can have a function of life except what has life, which is the potential principle of such action.
Peace In Christ