The thread have taken a left turn somewhere.
The OP asked about masturbation, and he asked to understand it as a Catholic.
SteakNPotatoes is defending his own reasinging on the subject, but let me address the OP.
Mellon00collie, to get back you your question.
I’m very happy to hear that you want to please God as much as possible and that you want to do it as apracticing Catholic.
I’m not the best authority on the subject, since I have been questioning it as well

, but let me share my findings here:
So, first, to be a Catholic and receive Jesus in the Eucharist, we need to adhere to the rules of Mother Church, even if we do not fully understand them. I can tell you this, because I have abstained, even through all my questioning.
Okay, the teachings of the Catholic faith is about the good of our souls.
People sometimes only think about the physical, but neglect their souls.
And while there may not be anything physically wrong with masturbation, when approaching things as practicing Catholics, we must also consider the spiritual aspect and our immortal souls.
This brings us to consider our Creator…God and how he made us.
From this point of view we approach the Catechism, that contains the teachigns of the Faith, as laid out by the Early Church Fathers.
*
2352 By masturbation is to be understood the deliberate stimulation of the genital organs in order to derive sexual pleasure. “Both the Magisterium of the Church, in the course of a constant tradition, and the moral sense of the faithful have been in no doubt and have firmly maintained that masturbation is an intrinsically and gravely disordered action.” “The deliberate use of the sexual faculty, for whatever reason, outside of marriage is essentially contrary to its purpose.” For here sexual pleasure is sought outside of “the sexual relationship which is demanded by the moral order and in which the total meaning of mutual self-giving and human procreation in the context of true love is achieved.”
To form an equitable judgment about the subjects’ moral responsibility and to guide pastoral action, one must take into account the affective immaturity, force of acquired habit, conditions of anxiety or other psychological or social factors that lessen, if not even reduce to a minimum, moral culpability.*
Okay, first they say here that it is a grave act. This is the first requirement for mortal sin.
So, if you engage in grave matter, with full knowledge of what you are about to do, and you give yourself freely to this act, you commit a mortal sin, and hence remove yourself from the grace of God.
They also say that it’s not what God planned us to use our sexuality for. God intended for us to use it in marraige, for pro-creative and unitive aspects. This is where sex is good and right.
Masturbating takes the focus away from the unity of marraige and abuses the faciliites for something it was not intended for.
Again, please know that we are considering this from a Catholic standpoint for the good of our souls.
Please let me kon wif you have more questions or if I can clarify anything for you? I’ll try my best.
In Christ,
PM