No gallery is going to give you an exhibit if you have never shown anywere before. You need to build up an exhibition record by being part of some group shows before asking someone to give you your own exhibit.
If there is an art museum or non-profit gallery where you live talk to them about upcoming calls for artists to submit work for exhibits. Often museums and non-profit galleries have themed exhibits (eg. self portraits, cars, landscape, etc) and ask artists to enter work for consideration. It will take you YEARS of exhibiting like that before anyone will give you a solo show because that's an honor given well known professional artists, not beginners (and even if you've been photographing 40 years you are a beginner to the art world's rulers if you have no exhibit or publication record).
Commercial galleries, that is ones that exist to make a profit for the owner by selling work, will not likely be interested in you until you've built up a resume too. Museums and non-profit galleries don't care about selling art even if items are for sale from some of their exhibits....they exist to bring good art to the public, and are often interested in seeing new talent.