I mean, who am I kiddin'? I ain't even in the guy's league.
4 seconds sound clip from the Rocky (1976) movie soundboard.
You can hear this line at 01:37:35.627 in the Blu-ray version of the movie.
Quote context
[...]
- Well, I'm wearin' white pants with a red stripe.
- It doesn't really matter, does it? I'm sure you're gonna give us a great show.
- Try to get some rest, kid. Good night.
- Apollo?
- Yeah.
- I've been out there walkin' around, thinkin'.
- I mean, who am I kiddin'? I ain't even in the guy's league.
- It don't matter, 'cause I was nobody before.
- Don't say that. Oh, come on, Adrian. It's true. I was nobody. But it don't matter either, you know?
[...]