Writing what I know

I feel compelled to write, but what should I write about? I've heard writers should write what they know. What do I know?

I know music, to an extent. I know games, and I know what it takes to make someone feel like shit.

I can lie, and sometimes I know how to get caught.

I know what it's like to be made to feel weak and worthless. I've also discovered what it feels like to be seen as strong.

I also know food. I know food like a lover is known; from head to toe in intimate fashion. And food, like an ever present object of desire, need and affection, is a monstrous and needy partner.

I simply can't keep her from killing me, yet if I quit her I'll surely die.