How do I convince my parents not to be miserable and disappointed that I don’t want to have a partner and children?

My parents are very conservative and they want to have grandchildren. But I’ve had such awful experiences with women (I am guilty of that too), that I don’t want to have a partner anymore. I just want to be alone and mind my own business. I don’t think I’m good enough for what women want nowadays in men and I don’t find a woman who fits my preferences either. I don’t sleep around, so I don’t have any sexual interactions with women. But my parents are sad and disappointed and we have arguments because of that whenever we meet.

How do I convince my parents not to be miserable and disappointed that I don’t want to have a partner and children?
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