Spanish is not my "natural language" too, but I like to read, write and listen / talk in Spanish. I already speak fluently 4 languages and trying to learn a bit of Greek now (but not sure if I can at my age). I like to speak multiple languages because only like that I can understand the world and always have a door open.

Sometimes, when others don't know you speak their language and you are just listening (like you do not understand) you can see if they really have good intentions with you and not talking bad about you.

The language advantage is very important.