I wouldn’t worry about going blind just yet as you haven’t even been diagnosed, sounds like at present you are a suspect glaucoma.
You should have had your eye presures checked and visual fields tested, by definition you don’t have glaucoma until you start losing parts of your peripheral vision.
Eye presures can be tricky, the is a normal range ( up to 21mmHg) howeve for some people it can be normal for them to have pressures above this and never get glaucoma, othe people can have pressures lower than 21 who do develop glaucoma.
Having a deep optic nerve can be perfectly normal, depends alot on the shape and size of your optic nerve head. I’ve seen some very dodgy looking optic nerves in people who have never shown signs of glaucoma.
Annual monitoring is common practice, glaucoma changes generally happen slowly so the hospital will know more when they have more pictures to compare.
In the mean time if you’re worried you could always get more regular eye tests and have your pressures and fields checked to monitor for any change.