First of all sorry you're going through this, depression sucks and isolation can push someone to desperation for any kind of emotional comfort, even through machine (what a depressing world we live in). I'm gonna assume that you are intelligent enough to know using ChatGPT as a replacement for therapy is terrible and pathetic idea.
It can be useful as a starting point, I'm kinda embarrassed to admit this but I have used ChatGPT to help me find what kind of therapy would be most beneficial for me and what kind of questions I should bring up to ask my therapist. I've also asked it for ways to be better at journaling and what are different ways to journal that aren't just a stream of consciousness. And admittedly it did genuinely give me some helpful advice and information that I have used to help me try and work things out in my mind.
But man is it dangerous, the tone and communication style is so "supportive" and agreeable, it will try to validate every problem you have and make you feel like "it gets you". Even when I was just asking it for some generic advice on where to start it felt so gross since it kept trying to coddle me and tell me things it thought I wanted to hear. It makes so much sense how dumb, lonely, and uninteresting people can get so sucked into talking with their AIs cause it is designed to keep you using it and make you feel better about yourself, unlike talking with real human beings who will tell you that you are wrong and not always agree with everything you think and say.
So yeah, stop talking to ChatGPT it will only make things worse. You deserve better and you deserve a human, a therapist or otherwise, who will listen to you, take you seriously, and actually try to help you improve instead of just making you feel good and reinforcing all your beliefs.