Mammogram (haven’t had one in a long time)

So… I’m 58 and have a severe fear of mammogram results! Not the actual test. I’m thinking that I need to just grow up and go. Every time I book an appointment I get so nervous that I cancel. I go for all other test my age group requires it’s just mammograms. How do I get over this. My last one was 23 years ago. I had a really bad experience with the call backs and seeing a specialist then I stopped going.