I agree with the others, being single for twelve years is nothing about which to be embarrassed. I admire you! I was never single from young teen years and the hassle I experienced until I met my husband and married him at 25 was unbelievable. Yet in a way I enjoyed the angst and missed it when I settled down - not now though, no way.
I was widowed last year and I know there is a big gap in my life now, I have changed and don't want to do anything or go anywhere - much prefer having a long sleep! It won't last forever though, eventually I will have to engage with real life again. However, having a new man is definitely not on my agenda! I want to enjoy being single, up to a point I am enjoying, just not very active - but being on my own I can please myself.
I have one adult child who is lovely, he lives nearby but works abroad a lot and I'm grateful for that. I have long periods of time in which I'm not being pressurised into being organised :-).
Enjoy your life, you don't need a man to define you. If anyone asks you how long ago you had a relationship, just say, "Oh a very long time ago and I'm content as I am at the moment".
Who knows what is round the corner?