It's interesting to me to discover that there are some stable personality traits that can be found among first born / single childs, and find that I'm also demonstrating some predictably consistent characteristics.
For instance, first born / single children are:
1) more socially maladjusted
2) less responsible
3) more individualistic
4) more self-centered
5) more likely to be perfectionist
6) more likely to mature faster
7) have higher achievement motivation
8) less agreeable
9) less open to new ideas
Time for some self-psychoanalysis!