What's the hardest part about dating YOU?

I have PTSD and OCD which both cause me to constantly look for and obsess over every reason why the person I'm with isn't the right person for me. It's not fun for me either, I'd love to not constantly think about it but anyone who has OCD knows it doesn't work like that. I can be totally into someone yet become completely repulsed by them in a matter of seconds. Imagine adoring someone but the more time you spend with them you find more and more things you don't like about them. I don't voice these thoughts and I don't make it the other person's fault, but I do usually end relationships pretty suddenly because of it. I've had times where I'm able to stop the thoughts and was able to have happy relationships for some time but more often than not, the thoughts eventually win.

I am really codependent so I kinda like the big brother personality that wants to take care of me and look out for me. I also like to sleep alot and fall asleep in moments like in the car or watching a movie sometimes so they'd have to be okay with that part of me and that I'm a little like a kitten. I guess haha.

I have zero experience when it comes to dating as ive never been in a relationship or been on a romantic date with someone therefore I am and probably will be forever alone :( oh well, guess I don't have to share any of my belongings or food with anyone, BONUS!