Men complain about being lonely, but when I date someone and tell them I’m waiting for marriage they disappear?

I’m almost 30 and yes still a virgin. I have very good discipline for myself and self control and prefer hobbies and more mind stimulating activities (problem solving) so I don’t have a high sex drive and my soul does not allow me to sleep with a man who is not right for me. Marriage would show me that this man is devoted to me. But no man wants to be devoted to me. Will I die alone? I would rather die alone than to sell my soul. These men literally lose interest straight away almost. Why are men like this?
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After reading these replies, I am even more adamant to remain celibate until marriage. Imagine sleeping with a guy he turns out to be like the a holes in the comment sections. I would never forgive myself. Call me a red flag for all I care. I have my values and I am sticking by them. I have better things to do then to give myself to some man that isn’t committed to me. If I am not worthy of commitment then he is not worthy of my body. And that’s what’s called self respect..
Men complain about being lonely, but when I date someone and tell them I’m waiting for marriage they disappear?
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