I too am a Catholic and had at one time entertained thoughts of the priesthood...not to be priest of a parish, but I had my eye on the Congregation of Doctrinal Study. However, being that I am gay and knowing the stance of the Catholic Church on homosexuality, I chose a secular education after my military service ended abruptly. It is not my right to tell a private and ancient institution that they must change simply because I will it. It isnt even the right of society at large to tell a private institution to change.
Catholicism, and Christianity as a whole, is built on the premise of a final Judgement. "Secular christianity" has sanitized this idea over time, but Catholicism has not. In the end, every man will be held accountable for each and every sin he has not sought forgiveness for through Christ our Lord. To seek forgiveness with the fullness of a repentant heart is to wash away that sin and thus, make it as it never happened. That is the mystery behind Catholic doctrine...and that partaking in the eternal bread and wine of Christ's body and blood. It only stands to reason that the caring priest and the loving mother church would instill in the congregation the gravity of knowing one's sins and bringing them to God through confession and to seek absolution through the communion rite. Sin is original to man, passed down from the first knowledge that we were naked in the Garden and we were brought to that knowledge through the deception of the Serpent and Eve and the weakness of the flesh of Adam. No one can escape the sin that is woven into our very being and so, through meditation upon this sin, the congregation is more likely to seek out forgiveness in earnest.
The mass is not meant to make you feel good about yourself. It is meant to celebrate the sacrifice of Christ and to remind the body of Christ what brought the need for that sacrifice. It culminates in the partaking of the fruits of His holy gift and hopefully in the resolution to make similar sacrifice in our daily lives. The mass has nothing to do with feeling good...it has to do with honoring a gift that we truly do not deserve.