Accidently saw underage porn and have visuals stuck in head

Sorry if the following is too wordy, but I needed to explain everything the best that I could and try to give enough context.

There’s this website called Tumblr where you follow other people’s blogs and then have the content that they post appear on your dashboard (essentially a Twitter Feed) along with all the other content from other blogs that you follow.

I was browsing through my Tumblr that I had used for following blogs that posted pornography with the intent of unfollowing any previously followed blog that I came across that I had found posted something questionable. All these blogs that I’ve followed listed their blogs as being “18+ only” or posted content that was clearly shown to be legal. But some content that they posted would sometimes be a bit too raunchy or too disgusting, which became more apparent over time since me following them originally. I never saw anything illegal that was ever posted from any of these blogs I’ve followed, and I never thought I would, but some things were a bit too gross for me to continue following them so I wanted to just ‘weed out’ certain blogs.

One blog that I followed, which listed it’s blog’s content as “18+ Only,” posted a video of a person’s penis ejaculating with one of the original posters of the video saying something in Korean but with the number 16. I only glimpsed at the video and was not attracted to it, but I saw enough to get a clear visual of the contents of the video. I was extremely worried that I had saw something illegal and didn’t want to have that visual stuck in my head so I double checked the original blog that posted this and saw the description of their blog say something in Korean with the number 17 and their background picture on their blog be of multiple penies. So I immediately clicked out and Google translated that post that said something in Korean with the number 16 to find out that it said what I suspected it saying; “16 year old.” So this blog’s poster that I followed didn’t realize where the content he was posting was coming from and unknowingly posted an underage person. The double checking was, besides not wanting to have seen something like that, also to double check if I needed to unfollow this blog I’ve previously followed.

So at this point I’m now extremely grossed out and worried of having those two visuals forever stuck in my head. After trying to not focus on what I’ve saw, I went back to my Tumblr dashboard to try and see if I needed to unfollow any more blogs so I can just be done with it once and for all and not have to worry about it in the future if I do choose to go back onto Tumblr. Well, one blog I’ve previously followed posted a video that seemed questionable (I don’t remember the video exactly but it was styled like the previous video I think and I was also at this point just worried about any faceless pornography videos), so I double checked the source of the video to find that this blog posted content from blogs titled something to the effect of “16teenboy” and had a video thumbnail that I glimsped at of a young looking guy seemingly masturbating with his face showing. So, it was another case of someone unknowingly posting illegal content that I accidently exposed myself into seeing.

I couldn’t beleive it. Never in my whole entire life have I ever accidently stumbled upon something like this. When I originally followed these blogs their content wasn’t anything that was out of the ordinary, and I just assumed that a popular website like Tumblr would have been better moderated. These posts had thousands of reblogs too, so I at first thought that I was just worrying over nothing. I’m just super worried that I’ll never be able to get these visuals out of my head and that my mind is corrupted. When compared to most people, I would think that most people wouldn’t have seen something like what I’ve seen. Compared to most people I feel extremely disgusting in comparison to them and that I can never be looked at in the same way again. I just feel as though my mind is forever corrupted and that I should be locked away for having seen what I saw. Sorry for being so dramatic, but I feel so overwhelmed and disgusting. The OCD isn’t me worrying about being attracted to these videos, because I’m not (though I worry about somehow being desensitized enough to eventually become attracted to them), but me worrying about not being able to forget what I saw and then having more gross things visualized in my head.

What do I do?