Who am I? Part 3

I'm Caris's older sister.
This is something that I've struggled with because I feel like Caris is more like my mum and dad and so therefore, she's the one they prefer. She's not as smart as me in therms of intellectual prowess but I think she has far better "people smarts". She knows how to put people at their ease and seems to have a natural charisma. I'm friendly and genuinely pretty interested in people but I have the idea that I'm awkward and make people feel uncomfortable. By people I mean people like my parents and people from Collie. People more like me, intellectually or personality-wise I think I do go okay with, but for example, I feel really awkward a the hairdressers or with my sister's friends if they don't know me already. Caris is really cool in my view, where I'm just not, I'm awkward and geeky. But there's a contradiction there in that she says that she feels really shy and that she would never go out and do the things I do because she'd be scared. I don't think I'm shy at all, Caris can also be fairly unassertive, whereas I'm really not. I do always try to make sure my voice is heard and only back out of my own will.
I think me being "the smart one" has affected my and her relationship because of some things she said recently when i was telling her about the problems I'd been having with the idea of telling our dad what's going on. She was saying that mum and dad are so used to me being 'the perfect one' who sorts herself out, and her (Caris) being the one who's psycho and needs help. So now I've been having problems they don't know how to deal with it. I think she's right, I'm really really driven to appear dependable, reliable, the one thing they never have to worry about, to them. I want to look after Caris and give her advice, I can't really resist trying to fix her problems but she's got a real good head on her shoulders and while I think she's okay with and values the intention behind my advice, the situations and our personalities are often so different that there's not much she can apply.
We have lots of similarities, I think, because of our genes and environment probably. We're both organised, good in a crisis, get things sorted out first and get safe before we can let go and show emotions sort of people. We both generally try to make sure everyone else is okay before we let ourselves get helped or break down. And we both tend to worry a lot about what people think even if we don't much take it into account. We're both quick to anger, sadness, sort of heart on the sleeve people, but also quick to laugh and to love.