Penance and Holy Communion are two different
Funny - The Catholic Church says it is.
Quote: "And what does Christ do in the Holy Mass? He offers himself for us, as he offered himself on the Cross. He sacrifices himself for us. That is why we say that the Mass is the same Sacrifice as that of the Cross renewed in an unbloody manner on the altar. On the altar just on the Cross, Christ offers his body and blood for us."
For what?
Quote: "But the penitential act, if it is said well, certainly helps to obtain pardon for present venial sins as well as to stir up new sorrow for past sins that have already been forgiven. In this way it helps us to purify ourselves and so to take better part in the Holy Mass."
Source: The Mass Explained
So, you may want to change your tune.