A new beginning - again

In 24 weeks my family will be together for the first time in just under seven years, for my brother's wedding. The last time my parents and I (who live in Melbourne, though not together), my younger sister (who lives in London), my youngest sister (who lives in Colorado), and my brother (who lives in Massachusetts) were together was at my UK-based sister's wedding in Spain.
I love my siblings, and I'm thrilled at the idea of a reunion. I get to see my London sister most years, and I actually saw my brother for two blocks of time in 2009 (when he came to Melbourne and then when I went to the US), but before that it had been a while. My baby sister I also saw last year, after a two year gap.
However, when friends see photos of my siblings they very often say "Wow! You don't look anything alike!" Which isn't exactly true - my brother and youngest sister have the same colouring as me, and although my younger sister's colouring isn't the same, she has similar bone structure to my other sister. In fact, both my sisters look in some lights like our mother.
Here's how we look different - my siblings are all taller than me (my brother's 6' 2", my sisters are both around 5'7" and I'm 5'5" if I stand very straight), and they're all in the healthy-to-lean weight range. I? Am not.
In fact, only if I lost half my body weight would people feel the need to come up to me on the street and force feed me chocolate. I've long seen myself as fat, even when (as I look back on the few photos that survived my self-hatred-fuelled adolescence) I was slender.
Of course, that was in no small part thanks to years of bulimia. I (mostly) managed to stop the purging part by my final year of high school, though my current home is the first in which I've never used self-induced omiting to manage stress. The binging component proved more tenacious, and as a consequence I put on around 30k in the first six months after leaving school and was utterly miserable, which somehow went unnoticed by my mother. And in the years that followed I rounded that up a little further.
Although I've been within about 10% of my current weight for the last two decades and change, I've had enough. So, using this upcoming wedding as an impetus, I'm going to lose 25k between now and the middle of July.
I'll let Lynn write her own introduction, but we're going to be spurring each other on! - Alex