Again, a late entry.
I'm fourth in a family of eleven. I think I missed out on parental attention, you were only ever one voice in the crowd. The financial aspects didn't bother me so much, in fact these days I'm grateful for the 'make do and mend' mentality as I can cook a meal from scratch, manage a budget, and have got through two degrees without going into debt.
However, there has always been a sense that it did damage to my self esteem. One of the problems of being a member of a large family is that there is always someone who is better at anything than you. It took me a long time to recognise where my strengths are and for many years my overriding memory of my parents is of people with not enough time to speak to me. Unlike many others, I have very little contact with my siblings now, apart from the occasional phone call and visit. It helps, of course, that most of them live 12000 miles away. I had to wait unitl I was out from under their collective shadow to shine, so I'm in no hurry to go back. This is true of the vast majority of my brothers and sisters. Polite conversation and the occasional party, nothing more.
There are, of course, upsides. We all are fiercely independant, and, to a large extent, quite solitary. I could change a nappy and make up a bottle by the age of seven, parenthood held no real fears for me, I'd handled plenty of babies before. I've been financially independant since I was 16, know how to produce food from nothing more than a few widow boxes and know how t sew, knit and mend (though admittedly I'm not very good at any of these)
Mamzon is so right about the shagging jokes. It becomes deeply embarassing during the adolescent years.