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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. **
You’ll note that this paragraph - which is written for confessors, not penitents - applies in no way whatsoever to the use of pornography. Penitents for the sin of pornography will usually be absolved under condition that they promise to avoid the occasions of pornography, for example by installing filtering or “accountability” software on their computer, moving the computer to a common area, and destroying any existing copies of files or magazines.
Additionally, the paragraph refers to masturbation in general, which is any stimulation, no matter how brief. The longer any action continues, the more opportunity there is for reflection and choice.
Furthermore, there are means that can be taken to combat a habit of impurity: developing the will, prayer, fasting, cold showers, penance, frequent Confession, fighting impure thoughts, going to bed tired, wearing clothes to bed, tucking oneself in under a blanket, and humility.
If you’re serious about fighting your sins, you might consider reading books like
this one. If you just want a pat on the head telling you that you’re a good person, well, I’m sure you can find someone like a modern psychologist to do that, though you might have to pay them.