In an LTR and honestly it's going great. However, my girl is starting to get annoyed with my lack of talking about things that would obviously make me vulnerable.

Like she's asked about past relationships, why I never tell her what's wrong, what all my songs are about (I'm a musician), and just stuff that would obviously get me to open up that I'm hurt. Usually I just say, "eh it's nothing," ignore the question, or make it into a joke. But she says I don't take anything serious and she can't read me.

In an LTR what's the best way to work around this? She's starting to get more frustrated and sad, then trying to "stay on my good side." Is there ever a time to open up, or am I on the right side here.