Practical Parenting Advice Online Parenting Course
Please report abuses to AndyGill@practicalparent.org.uk
It is probably just a personality thing, my son is a bit like that although he got a bit better with age, maybe it was a confidence thing. Although he not the centre of things.
I wouldn't push or worry as some kids are just observer/receiver types in group situations and operate better one on one or in small groups.