I have great problems with my father. Sperm donor is a good name for him as I've no longer anything to do with him. My mother, I have spent a total of 5 days with her in my life after the age of 2. And then she went on drugs and now I've had to cut her off too.
I used to get jealous of my friends for having parents who cared about them when I was in school. I still feel jealous sometimes of my coworkers who have proper relationships with their parents. I feel saddened by their friends and hangouts as well as I don't have those. For me, jealousy is feelings of sadness and longing. But those feelings happen less when I have someone I get to play with. And I have one very close person who gives me that.
Feeling jealous is natural imo. Its knowing something should be a certain way and acknowledging it. But you're a stronger person every time you accept and move past it. pardon my opinion on your feelings as these are really just how I feel about mine.