Wait until you'll get to the lexical closures.
Than try to grasp the homoiconic property of the language - this is what makes it really different from the C-likes.
And make sure you'll learn a Scheme with a proper
define-macro implementation (I'd recommend Racket or Bigloo), not just standard hygienic macros (the latter would not surprise you at all if you're familiar with the C++ templates). Most Scheme textbooks would skip this stuff, unfortunately, but I'd argue that there is nothing nearly as important in Lisps as the proper macros.
It is also important to try to understand the purely functional subset of Scheme and learn how to solve all the possible programming problems with it. "Little Schemer" is a good starting point, but not nearly sufficient. Go through SICP"Structure and Interpretation of Computer programs" after it.