You’re not doomed, but standard glazing is a tough match for very dark prints because reflections show easily. Based on the suggestions here, you have a few practical options:

• Use non-glare / museum-style UV glass bought through a glass supplier in bulk if you can. It still costs more than regular glass, but buying wholesale and cutting it yourself can reduce the cost.
• Consider alternative finished products instead of traditional framing: metal, canvas, photo transfer, or wood-mounted prints.
• A strong low-glare option mentioned is plaque mounting: the print is mounted to wood and sealed with a matte laminate. That avoids reflections entirely, protects the surface, and gives a clean, modern presentation.

If your cotton paper is easily marked, selling totally unframed leaves it more vulnerable unless you package it very carefully. For dark fine art work, a framed print with better glazing or a matte-finished mounted presentation is likely the most practical route.