You sound a bit bitter.
I'm 20, almost a year ago I broke up with my ex. We mutually wanted marriage, but we weren't quite ready. Sparing the details, the break tore me apart more than I would've admitted. However, I took it to be a learning experience, so I don't make the same mistakes later. All the work, driving 45 minutes both ways multiple times a week, it was all worth it. It was worth it for both the good times then and the wisdom gained now.
As long as you don't do anything stupid that could cause a surprise life-change, the good times now and the wisdom later makes it worthwhile.