"
for gentlemen only
That's with the fortunate only
No I gotta be someone else
These days
Only gentleman can win this woman's love, and anyone who succeeds with her is fortunate. He could either be saying that he's not a gentleman, but he needs to change in order to be with this woman, or that he is a gentleman, but he doesn't feel that that's who he truly is, and he's "gotta be someone else".