Don’t know what to do

Hi this is kinda new to me so I don’t really know what to write but I’m 13 and I haven’t been diagnosed by a doctor but I’m pretty sure I have depression and anxiety as I have done about a million tests online. I’m also pretty sure I have ADD, but lately I’ve been feeling detached and numb, I also keep feeling like there is nothing wrong with and I want there to be or something like that. I have also self harmed before in January and June of this year (sorry if that was not a good thing to say for some people) thank you for reading also sorry that it’s a really long message 🙂😥