I have a friend who was diagnosed with a different condition at a similar age, about 15 years ago. He found having to stop driving one of the hardest things, as he loved driving. I would find it an inconvenience, but I wouldn't be so gutted about it.
His condition means he's often stable for a period, then there's another deterioration. Last year, he was able to make out that a team on the TV were wearing red socks, which delighted him. Recently, things have gone downhill again, and he can't really make out faces now - and I could see, when I last saw him, that he was having to feel for things more in the kitchen. His colour vision is now gone entirely. He is struggling mentally with the latest changes.
But he's still living independently. He gets lifts from people to the supermarket and so on. He's excellent at his job in a school, and they are really supportive of him. He can walk into town from his house - he has a white stick and his progress is slower than sighted people, but he can do it, so he can get his hair cut and tobthe dentist and so on.
His phone and TV has voice recognition - technology can really help these days - it can read emails and so on. Steps down are difficult as he has little depth perception, and being with him makes me aware of high/low contrast things. He has a lot of black and white in his house and good lighting, as that all works with what vision he has left.
He's on a waiting list for a guide dog.
It is shit, but it's not impossible. It is obviously a huge impact on his life, but for me, in many ways, it is one of the least important things about him. It doesn't stop him being interesting, thoughtful, intelligent, educated. Sight is only part of him, and it's only part of you, even if it doesn't feel like it right now.
There are various charities out there to offer advice. Understanding how your condition is likely to progress will help you prepare for it, and it is easier with current technology than it would have been 20 or 50 years ago, so start finding out about the options before you really need them.