When I was in high school I had friends who married their high school sweetheart, and then friends who had 3 or 4 girlfriends. I think from my Freshman year to Senior year I had 4 girlfriends.
I find that most of the time they dont last that long. I know a handful of high school kids and most of them have broken up 3 or 4 times with all different people.
Then once you go to college it is a whole different story. Depending on your area, many people move, so no one has LTR. Once senior year hits, and you graduate, many people move.
I mean if you are one of those select few who just finds the right girl, then great, if not, just date around. I had gf's for 2 months, 3 months, 6 months, etc etc. And EACH TIME I learned something new about ME and WOMEN.
I got a taste of many different personalities, and all of that stuff. This I think is good so you can actually get an idea of what you REALLY like.
I worked with a girl who had only one boyfriend and then finally broke up with him. I think she realized she was wasting her time. Do you really know if you are only with one person how other women are like?
I've learned much more dating more women when I was younger then I would have only dating one all 4 years in high school.
But to each his own.