Obviously, a 20 year-old was not the best measuring-stick in terms of what real-world dating is like. If you get out, and maybe use an online dating service, you should begin to meet more mature women.
As far as the JW dating experience goes, your post was actually very close to the truth. You also allude to what I consider to be the greatest Catch-22 that JW life has to offer: What to do with those biological urges in light of the fact that getting married when young is generally a very bad idea.
Of course, what to do is the JW version of Don't Ask Don't Tell - everybody knows that jw youth are sexually active, but as long as it doesn't 'come to light', nobody really asks said youth what they're up to.