Firstly, I’m so so sorry you feel this way. It’s awful and hard to see a way out. I know how it feels, because I have had bouts of terrible depression since a teenager, I’m now in my forties.
So I have lots of experience of seeing a GP. In my experience they are incredibly kind, sympathetic and supportive. You must be brave and go. The times I’ve been at my worst I literally sobbed and sobbed at the doctor, and it was such a relief to listen to their advice.
They will not force you to go on medication, if you do not want to. It’s true, the waiting list for talking therapy is long, but it’s better to be on a waiting list and having regular check ins with your doctor than sitting at home in misery waiting for the depression to magically go away. The GP can put you in touch with all sorts of different support groups.
But please please consider medication if you’re really suffering. After my latest period of dreadful depression, I did NOT want to take antidepressants because I had managed in the past to help myself with good diet, exercise, routines, self care etc. But this time it was so bad I just couldn’t do those things. My doctor gently convinced me that taking the tablets was not a cure for the depression, but would give me the lift to be able to do the things that would help. A bit like a set of crutches won’t cure a broken leg, but they help you to get moving and get some independence back.