Yes when I was a kid I was more fun loving & easy going. At 13, I changed by first becoming more social - see below in my comment to the other post - but that backfired for me really fast. End result was me becoming more isolated and introverted in behaviour. Though I was always introverted in behaviour as a kid before I turned 13: I did readily make contact in one-to-one situations (in my own rough way) but I didn't care about people otherwise... it was 13 when I started to care about people in general. That conflict has stayed with me since then. In certain periods, it was more of a conflict and that did make me more angry and stuff. At other times I reacted by withdrawing, making myself isolated. (Am I describing typical 8 disintegration shit now?) And what you say about certain emotions "hardening up" yeah, that's a result of that too.
None of this was family related though. I didn't start to play "rebel without a cause" at all. I didn't do the typical teenager rebel thing. For two reasons, 1) I didn't become social with my peers after all, 2) Family was never a true issue for me, I knew how to get my way or how to get through a situation otherwise Pretty much always felt in control at home, unlike with those social groups.
Anyway, yes it seems like it's common to get some change around that age, I'm chalking it up to some hormonal change