I think marriage is different because you gotta look at multiple aspects like financial condition, personality, compatibility, and even then the height plays a major role.
But when it comes to dating and hooking up, men under 5’10 are basically hopeless because no woman even if she was shorter would look at them as attractive or desirable, especially in today’s day and age.
It’s the first thing girls talk about when discussing a boy they’re interested in. “Oh he is tall and…and…etc”. So if you’re at the 5’9 average or below then im sorry to say but you’re not off to a good start in that regards, and even if you find someone to settle down with & she lowers her standards to be with you, there will always be that risk of someone taller than you either cucking you and fucking your wife or just straight up stealing her from you because he is genetically superior.
Sometimes the genetic lottery is cruel but you only play with the cards you’re dealt i guess