I would be at a loss for words in addressing my 10-years-past self. In fact, all my life I've been able to look back at my earlier selves and think, "how could I possibly have lived in something so small?" And yet I can't think of anything I could tell them that they could use to change the course of their life. At the most I might be able to put myself in contact with sources of ideas that were available before I happened to come across them, but beyond that I don't know what I could say.