Like any kid, I looked forward to and enjoyed receiving presents. And for the most part I learned to disguise any disappointment with the gifts, learned not to point out I already had it, it wasn’t something I liked etc.
Birthday parties were not something I enjoyed. I didn’t even want them. So much so that on one occassion I ran away from my own party and didn’t return until the other kids had gone home.
I guess social awkwardness becomes more of an issue when you are the center of attention, and birthday parties are one of those occassions.