I sometimes feel, as an only child, that I miss out on what it's like to bully my younger siblings. Can you relate to this?
Nah I'm a younger sibling myself. Being an only child must be weird, since I don't know what its like to not have siblings.
There are birth order dynamics to childhood development that I sort of just don't qualify for either.
I get what you're saying. What's weird to think about is that you can be born an only child but they can adopt and therefore you aren't anymore.
True. I wonder if the effect is totally the same though when your parents adopt vs. if they have a kid naturally.
Only child
An only child is a person with no siblings, either biological or adopted. 
Children who have half-siblings or step-siblings, either living at the same house or a different house - especially those who were born considerably later - may have a similar family environment to only children, as may children who have much younger siblings from both of the same parents (generally ten or more years).
Overview.
Throughout history, only children were relatively uncommon. From around the middle of the
relief, but I sometimes catch myself waiting for things to get hard again when she has a relapse. I always find her recurrences a bit stressful and not just form a technical view (i.e. wanting to make her condition looks authentic). I know it's acting, and it's not real, but when Sarah's having a recurrence I do feel a bit of what it must be like when something like MS changes you – and changes the way people relate to you." In November 2010 Sarah leaves Ferndale,