Most Helpful Girl
Lots of guys with narrow shoulders are attractive! Even if people bulk up, slim down, and tone up, that's just muscle mass, and there's really only so much we can do about our bone structure. So I wouldn't worry about it. When a girl is into you, little things like that won't matter much, anyhow.
Most Helpful Guy
How wide is wide, bro?
If your shoulder matches your body type, then it's ok.
Also, you can still work out to get a fit body.