Please put the blame on teachers for the way your children are. I was painfully shy as a child outside my house but very strong academically. would not speak up in class and had a handful of friends. Mum noticed it, perhaps from my sch report and did a lot to help me overcome it. I am still quiet but not as self conscious as my 9 year old self.
I am fortunate to be blessed with 2 DSs who are extroverts (although some days I wish they were more like me). Below are the comments we have gotten so far for DS1 (just finished Y2)
Pre-sch - Very confident, polite, caring but can be boisterous.
YR - Polite, confident, but very competitive and likes to be the first/only person to get a question right. We took her comments on board and worked on the competitiveness.
Y1 - Polite, confident, friendly but needs reminding that calling out in class is unacceptable
Y2 - Polite, confident, has a wide circle of friends, sensible.
Basically because we have picked out the boisterous, uber-competitiveness and calling out and worked on them in Y2 those sort of comments were not on his report.
For DS2 his report says this
Pre-sch - Confident, has a strong friendship group, a very kind and loving boy, gets frustrated if he isn't the winner, can be boisterous but very quick to say sorry.
We will be working on the areas that we feel needs attention.
I think for your DC's sake you need to take the comments on board.