Is being asexual wrong

Hi! Ok so I'm an asexual and whenever I tell someone they always tell me I'm "figuring it out" or " How will you feel when your older with no children!" I even had someone tell me " It's your job to have children, it's the only thing g women are good for. I can't consider a woman a human if she isn't a mother by 20." Any advice on what I should tell someone if they ask or I'm in a situation where I ha e to tell them about my sexuality?