What you feel is understandable because I don't celebrate as well. I don't posy or even give a hint to anyone around me. I just take it as any normal day.
I do agree that it sure has to do with internal challenges as to why we don't really fancy these moments. I celebrate others, even call, but for mine, I always prefer it very simple. No noise, just silence and being alone, lol.
However, as time goes on, I have come to realize that I do need to make an exception for that day. It is not necessary I go out. Staying indoors, I still have fun doing things I enjoy.
I think I celebrate more Father's day than my birthday hehehe crazy right?
Haha, it isn't. It just the one that speaks to you more, I think.