I think not all who marry young like that. I also read a lot and saw young people married young but also happy they could build a happy family. they can open a business from small and run together. getting married is easy no matter as long as both can be responsible for accepting each other. and be grateful for every provision given by God. and in my religion it is also explained that by marrying God, we will add sustenance to us. and getting married can easily avoid adultery.