For high school I was homeschooled and never had much contact with the opposite sex. My parents didn't believe that it would be a good idea if I had a girlfriend before I turned 18 and that led to them stopping me from talking to girls and interacting with them much.
Then when I did turn 18 and went away for college I had all these limiting beliefs in my head due to my inexperience. Lost my virginity at 19 (finally) and had about 2 more lays after that but other than that I didn't have much luck with women. The college I went to and graduated from (about 3 years ago) had a "party school" reputation and was even ranked as a top 10 party school by Playboy.
Observing some interactions I noticed that it was mostly athletes and guys in well known fraternities that were out with girls or having a lot of girls in their lives. The other guys were either in relationships or really busy with their academics to even care about girls that much.
I was also pretty aggressive in college, often talking to girls and approaching them and not being shy about asking them out on a date. In the looks range I didn't have the muscular body but my body was fairly average looking and I am about 6"3, people told me I was handsome a few times back in college.
But still I wasn't experiencing the wild hook up culture people talk so much about when it comes to American college campuses
Then I graduated (engineering major) and got a job and in the past 3 years I have been with around 15 different women for casual sex and been in long term relationships with 2. The quality has definitely gone up as well. Back in college I could not imagine dating a girl that was attractive enough to turn heads but I have dated 2 girls like that ever since.
Even though I am a little more muscular now than I was in college, personality wise I am still the same me. I am still outgoing and still not shy when it comes to talking to women. Pretty much do the same thing now than I did back when I was in college.
The reason I posted this thread is not to brag but to know why I wasn't able to get with any of the hot girls back at my college campus yet I have managed to do so after college.