It's a matter of style.  Note that your example is the same: both are from Johnny's perspective, just he's referring to himself in the third person in the second case. Personally, I prefer the first example, as third-person self-reference has always felt a bit awkward to me. I never refer to myself in the third person in my thoughts. 

Whichever you decide, you should remain consistent throughout. Inconsistency in any form, be it exposition, dialogue, or your personal writing style, throws your readers off, and can keep them from immersing in the story.