I too had a disagreement, it was at birth and with the one who circumcised me. I kicked the hand holding the scalple (no doubt in protest to th pain)
and nearly lost my dick in the process. Consequently I had a deep thick ugly scar on the underside of my dick but with various applications, mainly containing silicone I have managed to reduce it considerably. I believe they use silicone patches after surgery now to help prevent scaring and using patches may help you. Another aspect worth trying is psycology? You say just looking at your scar brings back the memory. Well just concentrate on that first punch you gave him; it must have been a good one, you knocked him down! That's something to be proud of; he got your dander up and you let him have it- bam, I bet that made you feel good. When you next look at your scar relive that moment and revel in it, feel good, don't think about what happened when he got up.