Your personality changes... well, until a certain age apparently. A study of 144 boy in 1st grade in the 60's revealed something interesting. teacher's noted their personalities. After 40 years, they got reinterviewed and it was found that their personalities remained the same! So, the personality you have in 1st grade is the personality yo have for life.
Think about that for a minute!
I did.... more so because my son is in 1st grade. If he keeps his personality, I'd be more than happy. He's positive, information seeking, loving, and I wont change any of it. Apparently, I couldn't' change it much anyway, but I wouldn't want to!
Here's a link to an article on the study - http://www.clevelandleader.com/node/14313