My name is Erin, my birthday is shortly before St. Patrick's day, and I grew up in an area with a large Irish population. For a few years, I thought all the "Erin Go Bragh" signs in store windows etc. were for me! I couldn't figure out why they said "Go Bragh" instead of "Happy Birthday" or something like that though (I could read pretty well).
A childhood belief about birthdays

others believed things like this
- Until I was well along in years I always thought our family was Irish because my dads birthday was March 17th— Gladys
- Up until I was almost 11, I thought that a birthday suit was a special outfit you wore only on your birthdayAnon
- I used to think that a birthday suit was a special outfit you wear on your birthday— Bri
- When i was little, I used to send Jesus birthday cards on christmas and thought he would read them in heaven.Anon
- I used to believe that on your birthday, you didn't advance to your next age until you ate your birthday cake.— Casi
- My parents have the same birthday -- month, day, and year. I though all mom's and dad's had the same birthday.— Cait