Only On The Outside
If only my gender changed and not the rest of my DNA, I don't honestly believe I would be very different. Some of my personality traits might have been more acceptable but others less so. Perhaps I would have been bullied for not fitting the mold, but I never fit the mold of my current gender either. Maybe that's why I don't feel it'd be a huge deal.
This however is only taking me into consideration. I can't be sure that the pressure to conform wouldn't have been higher as the opposite sex. However looking back at my younger self they really didn't give a ****. Maybe though my relationships with my family members would have been different, perhaps I'd be changed as a result, at least outwardly. Still no matter how different I seemed I think my core self is gender neutral and wouldn't be far off from the me I am now.