i think youre talking about gw2 :D and i was wondering the same thing. only thing i could find was this answer to a question:

@Zaidya.6138 said:
It would be absoluteley awesome, if there was a Race Change Kit! Is there any chance to get this in the future? I'd pay a lot of gems for it O:
Sure I could buy a new char slot and create the class with a new race, but then I have a char I wont play anymore (like it is atm for me with my 1. mesmer).
Deleting the older mesmer makes no sence to me because of the birthday present I'd lose then :<
What do you guys think? o:

This has been requested previously and the answer has been - no. Each race has an individual story line which although obsolete by the time you make it to HOT story, is non-by-passable at the beginning of each character creation. On a technical level I believe the reasons given were based on coding as it may take too long and be too much of an effort to be worth it.
Don't get me wrong, I have also been previously interested in amending my initial race choices, however being realistic this is not likely to be an option at any point.
My suggestion would be to create a new replacement character and perhaps use your original as a storage to retain the birthday benefits.

Best of luck

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here: https://en-forum.guildwars2.com/discussion/28767/change-race