Meggle, trust me, this all comes out in the wash. Children who are gentler than average at nursery do soon learn the interpersonal skills, or the coping strategies, to get by at school and in group settings.
I speak from experience. Mine was a right little Fotherington-Thomas at three and adorable with it.
OK, at eight, so he is still more of a Mr Puniverse in terms of team sports - but good at tennis and in demand as a fielder for cricket - and not one of these Harry Potter-tearing, gurl-despising little hulks, but he has good friends of both sexes and is, as the French say, bien dans sa peau.