Was Not Made to Be Subtle Meaning?

To be "not so subtle" is to be less subtle/inconspicuous/not obvious as something else, though what that something else is is often not actually stated.

What does it mean to be a subtle person?

A subtle person cleverly uses indirect methods to achieve something. I even began to exploit him in subtle ways. Synonyms: crafty, cunning, sly, designing More Synonyms of subtle.

Is being subtle bad?

Subtle is sometimes used to describe something which is overly clever, and therefore wrong or misleading. But this semi-ironic usage of the word is itself pretty subtle (heh), and depends heavily on context. In any case, this doesn't sound like the word you want for your context. Subtle is neutral.