In my early teens I liked to sing in own imitation language - no clear sense, only expression of emotions. I had an idea, that there are somewhere some beings, who can hear my songs and understand.
Now I have similar feeling when I listen to songs in Japanese - most sound aren't strange for Russian ears, but I cannot understand a word. It reminds me on my childish languages.
Now, as I study linguistics, I work on two conlangs with complex grammar and nice scripts. I also have plans to learn one of conlangs, not like esperanto (i know basics of it), but like lojban or ilaksh - it is interesting for me, how language can express structure of thought and feelings.