Curious why some guys struggle and others don’t

So I’ve posted on here before trying to give hope but honestly curious why it is that some guys who are my height (5’4) or close to it tend to struggle while I’ve seen others do well. For example, given my history, I’ve slept with 5 women, two of them relationships, 2 hookups and a current fwb. All 5 women have been skinny and above average in attractiveness, I’m kinda picky a bit. While I wouldn’t say those are big numbers, I was in a relationship for 5 years so while I’m only 24, I’ve slept with 3 of those women in 5 months. So what do you think separates guys who do okay and others who struggle more? I know other guys my height who also have similar numbers but I am curious what the difference is.