i know how you feel, you can't delete your posts/threads on your own, i wonder if the moderators would delete your account or delete a post/thread for you but then probably especially on a mental health site a lot of people would be asking to do that, this site goes fast, has more people than most sites, but i wonder if they can change it so that you could delete your own post and even better, thread if let's say no one replied to it. there was one time i could do that on a forum
Whilst on the forum landing page you should see a 'members online' section. Here you can contact a green or orange name directly - these are moderators and maybe they can help. There's also a 'contact us' button at the top of the page.
This forum is a safe place for everyone and you can be as anonymous as you like, post what you want and not post what you don't want. Even if you never post again it can be really helpful to know others are going through similar experiences and inspiring to read how they overcome them.
Whatever you decide, hope you are OK and all the best.