i have a children account, but i'm 20 years old -.-"
how could i change my account???
You should automatically be upgraded to an adult account after turning 18. If you have entered the wrong age when signing up to XBL you cannot change it and must wait or set up a new account.
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Above poster is exactly right. Other complication would be your account isn't the master account and you have been setup as a child's account
Try logging into the parent account and promote the account from there by following these instructions
If you cannot log into the parent account, you will need to recover the account here
If that fails, contact Xbox Support
Once you've promoted the account to an adult, doesn't that remove you from the Gold Family Account?
Where did the OP say he was part of a Family Gold Plan? OP, you should be able to promote your account to adult status by doing what DavBlayn suggested.
Adrian, yes, if you are on a family plan, then promoting your account will remove you from the family plan, however I do not believe this is the case with the OP.