Parasites are not contageous

No one in my family has gotten parasites but me. Not my ex husband, not my children, not my parents, nor any boyfriend. I have shared beds, bathrooms, towels, food, saliva, and body fluids. No one else has ever gotten sick and iam chronic. Ive coughed them up, pooed them out, had um come out my nose. parasites are not contageous as people think.