Native English speaker with a few remnants of Spanish and Italian kicking up in my head somewhere from my high school days. More recently I've been trying to pick up Japanese, which is proving to be about as difficult as I expected it to be. Having a lot more luck with Japanese -> English than the reverse, which I guess is just a consequence of not having that many people to speak to and needing to make some serious tracks on my grammar. But since I'm nowhere near fluent with any of the three secondaries I listed, it's hard to say how it's changed me. With the Japanese at least it feels like I'm working toward a long-term goal, and I find myself actively remembering more and more pieces of it as I go, which is a nice feeling for someone with commitment issues.