"Si Lo Uso" is Rawayana telling the critics to mind their own business. The singer isn't trying to stand out: "Yo no quiero resaltar" (I don't want to stand out), he just wants his guitar and nothing more. But people keep telling him how to live, so the chorus pushes back: "No me digas cómo lo tengo que usar" (don't tell me how I have to use it) and "Busca algo que te guste, no me sigas, ten personalidad" (find something you like, don't follow me, have some personality).
The verses get sharper. "Busca tu propio camino y no te metas con el mío" (find your own path and don't mess with mine) uses meterse con, a very handy phrase meaning to mess with or pick on someone. "Eso no es de hombrecitos" (that's not what little men do) is a cheeky jab: hombrecito is a diminutive, so it mocks the critic while telling him to grow up and "aprende a criticar" (learn how to criticise). He even asks for "algo productivo, que no sea pura basura" (something productive, not pure garbage). It's a laid-back groove with a pretty blunt message.