It's a bitter remark on filmmakers on interviewers telling them to "act naturally."
The song basically means, "If you want me to act naturally, what I'm really like is a lonely man and a big fool."
Other sections of the lyrics are about this innocent person who thinks he's going to be a movie star, but the filmmakers are actually making fun of him, portraying him as a fool, and considering him one already without having to act.
![Cover art for Act Naturally [Original 1965 Stereo Mix] [Version] lyrics by The Beatles](https://images.songmeanings.com/caaf45d8-60ff-4e86-83be-0ed62fb57415.webp)
It's a bitter remark on filmmakers on interviewers telling them to "act naturally." The song basically means, "If you want me to act naturally, what I'm really like is a lonely man and a big fool." Other sections of the lyrics are about this innocent person who thinks he's going to be a movie star, but the filmmakers are actually making fun of him, portraying him as a fool, and considering him one already without having to act.