What do i do

I have fantasized about my stepmom since around the age of 12 and am now in my 50s!she is no longer my stepmom and I still fantasize about her !! She wore nylon bikini panties and I use to use them during my relief time I still purchase panties and use them while thinking of her.this seems to be the only things that get me satisfied! What should I do I am single so it's not affecting anyone else