Hi Doggiedo
I'm a slightly younger woman than yourself and have had penetrative sex with 13 men, but have lost count when it comes to other forms of sex. And I feel no shame etc

and nor should you. As long as you sexual encounters have been between consenting adults there is nothing wrong with having multiple partners. As others have said perhaps you need to explore your reasons behind why you feel bad
Oh and just to let you know of my friends I have had the least amount of sexual partners