Thank you so much for sending this ask. Even though I'm often bad at explaining things, I'd still be glad to help. At the very least I can say that acknowledging that portraying adult/minor romantic/sexual relationships, incest, and rape in a good or sexualized light is wrong and why that is. Those are things real people go through and it's a different matter than violent video games as, in my impression, they affect different parts of your mind.
Took me some time to realize that. Issues like that were why Twilight and Fifty Shades of Grey were criticized for so long after all, as those books gave completely wrong ideas of how relationships worked which often lead to young people getting into toxic relationships. Real people have the "I can fix him" mindset that's so common in romance fiction, so it's not too farfetched the same thing applies to proship content.
I feel lucky my old proship mindset didn't bleed over to real life contexts, but it sure as hell wasn't good for my mental health in the long run. Hell, I felt like such a kid living with my mom I saw myself as the loli in adult/minor ship situations for a while and I'm thankful I grew out of that.
And just think, average people would be outraged and disgusted if anyone admits to finding a child character or an incestuous ship attractive, or anything similarly problematic, and you don't want to have that secret burdening you. It's one thing to watch Game of Thrones for the drama, but outright glorifying incest by portraying it as sexy and cute is a whole other story. This is why many victims advocate for stories about subjects like csa, incest, and rape to be handled in a more respectful and realistic light and not be glorified or treated as plot devices that can be thrown away.
I also looked it up and loli first became a thing when women started becoming more independent in Japan. It was based on a fantasy men over there had involving subjugating young girls, which makes lolicon's origins pretty misogynistic on top of the more obvious issues.
Sorry if this seems more like a ramble, but I hope this helps. I've been down this path before, and with a little work, self reflection, and friends that can help steer you in the right direction, you can break out of proship beliefs.
To any ex proshipper out there