No, it ain't a bad thing. I guess it just means that you aren't exactly an open book.

[Haha, book pun.]

Haha...I think I get that, though. [Keeping things close to the chest, he means. He practically has his heart on his sleeve, but there's some things that even he won't just tell anyone.] And besides, why waste time on someone who doesn't want to actually get to know ya?