When I went the question wasn't "What is wrong" it was "What brought you here, and what do you want to be different at the end of this". I think if you give an honest answer to either question that can be a pretty good starting point. Even if you feel your honest answer isn't specific enough (e.g. "I just want to feel like I am worth something" or "after this maybe I don't want to kill myself" or "I want to be able to enjoy myself more") the therapist can start there.
And really a large part of therapy seems to be diagnosis, with the added benefit that the clarity you get from working towards diagnosis (and the ability to confide in someone) already being helpful.
I would suggest just going to see someone and being as honest about why you are there, and what you hope to change as you can bear. The therapist will take the conversation from there. And if you ever feel resistance to being honest about something, just say that. You aren't required to be fully open about everything.
And no therapist is ever going to sit there thinking you are an idiot. They are there to help people, and they probably recognize that seeking help is hard. I think they will appreciate and respect the effort it takes for someone to seek help. They certainly won't ridicule someone for not knowing exactly what they want. Because they know how hard that stuff is when it comes to mental well-being.
And really a large part of therapy seems to be diagnosis, with the added benefit that the clarity you get from working towards diagnosis (and the ability to confide in someone) already being helpful.
I would suggest just going to see someone and being as honest about why you are there, and what you hope to change as you can bear. The therapist will take the conversation from there. And if you ever feel resistance to being honest about something, just say that. You aren't required to be fully open about everything.
And no therapist is ever going to sit there thinking you are an idiot. They are there to help people, and they probably recognize that seeking help is hard. I think they will appreciate and respect the effort it takes for someone to seek help. They certainly won't ridicule someone for not knowing exactly what they want. Because they know how hard that stuff is when it comes to mental well-being.