Etowers, honestly I don't buy your excuses for OnlyFans at all. First, the vast majority of OF accounts cost money meaning if you were looking, you were likely paying. I doubt all of your social media friends were handing out their sexy pictures for free and it's even worse that you were targeting people you knew and had access to for this kind of media. There's porn for free of strangers that maybe your wife would feel better about, you know? Looking at sexy pictures of people you already know and/or talk to is already crossing a boundary for many.
If you were just curious to see if someone had an account at all and weren't looking specifically for their posts and pictures, you can do that without signing up.
One more thing - if this was an app on your phone and you weren't accessing it through the website, wouldn't you be getting tons of notifications when people you subscribed to were posting? I've never used the app but I'm assuming it acts like most out there and periodically sends you notifications which makes it hard for me to believe you weren't be reminded of it over and over again.
Be honest with your wife. You crossed the line. You wanted to see more of these social media friends. You've spent $X on it and hopefully subscribing to them was cheap for your sake. You would check up on them X number of times a week. IF you have done custom orders, you better tell her because it will be much worse if she finds out. Delete your account in front of your wife if you haven't already and give her full access to your phone, email, and social media accounts. That way she can rebuild some trust in you.
Lastly PLEASE get some IC because this:
I didn’t want to be with her because I felt like I was always failing her. I failed her in many ways that I thought that she would be happier without me so I was giving up. She begged me to stay but I always thought that she would be better off without me because I am a crappy person sometimes if not all the time. I don’t have much going for me. I told her that I didn’t love her because of how I saw myself.
Is extremely concerning. Healthy people don't do this and if you don't get this sorted with a professional, you will absolutely find yourself staring down serious marital problems once again if not a divorce. In fact, I don't see how your wife could ever feel comfortable staying with you long term given you have already told her that you don't and can't love her. She deserves better so go out and become the husband that she deserves.