I Am The Centre Of The Universe

I give myself a staunch, I even have my lunch, I don't give a hunch, But I give myself a munch, I don't want to throw myself a punch, I didn't resemble as such, I didn't pronounce that much, I give away to luck, I found myself a prick, I don't get myself sick, I didn't know there was such a prank, I want to be frank, I didn't want my heart to sink, But give me a lamb shank, For inhaling oxygen in the tank.