My sister's getting married this year, too! They got engaged last August/September after going out since around the November before. (They'd been working together for a few months before that - my sister did part of her nursing training at the hospital where he works.)
I was surprised at the range (and depth) of the reactions I had to the news - like with Mary's son, it was obvious my sister had met the right person, but I hadn't expected them to get married, at least not so soon (my sister's only 25), and as well as being very happy for her I've also found myself dealing with feeling quite possessive towards her all of a sudden, as well as getting very depressed last autumn that she'd found someone and I hadn't at all despite being two years older.
You aren't alone, tinners. Your post brought back vivid memories of the time my brother first got engaged, at the age of 23. I was 19, and I was very disturbed. I stayed awake for the whole of one night. It was the feeling of someone I barely knew invading our close family that worried me. It's odd, because I didn't particularly get on with my brother, so I wouldn't have expected to feel much at all. That engagement fell through, and when he did finally marry at the age of 39, I was already married with two children, and I didn't care a bit!
When I was reading Britten's diaries, I was struck by his comment when his beloved sister married. He said (understatement, I suspect) that he was "unsettled by Beth's change of state".
