Will using the gym's rowing machine make my upper-body look butch?

I know this is weird question. It's just that I've seen professional female rowers on TV and they tend to have the appearance of a wide upper body, in their arms and shoulders - and I don't want that. I think my shoulders a already a little wider than average for girls so I don't want to make them look wider. Should I avoid the rowing machine or can I use it and still keep a feminine shape?