How do I handle this with my girlfriend? Am I selfish?

My girlfriend and I have been with each other for almost three years and we are inseparable. She truly is the love of my life. We have been ually active for the most of our relationship and we have tried different positions and types etc. We both lost our virginity to each other which is a really special thing to have experienced. It seems as though lately she prefers to receive oral pleasure over any other type of . This is great because I love giving it to her almost as much as she likes to receive. I go down on her as much as she wants which could be everyday twice a day on some weeks. The problem is that she isn’t comfortable performing oral on me and will do it but I can tell she doesn’t like it. Regular she says still hurts her and I tried different lubricant and condoms. I have tried to have a conversation about it and lovingly tried to ask if she wasn’t comfortable having regular with me and she got all upset that I don’t like to pleasure her orally, which isn’t true. I am asking, is it normal to have a life with a partner where she receives almost all of the pleasure from me through oral? Am I being selfish for rocking the boat?