Been a while since i played, and since then I've chosen a new username and I want to change my current user to my new one. I cant find that option in account info any help would be appreciated

Pretty sure it’s impossible. Sorry ‘bout that.

You can submit a ticket to the developers, or start a new character

It is not possible to change either your main account username or usernames of your player characters. Of course you can always delete your character and create a new one with a new name. You can also create a whole new VO main account to change that name which is displayed when you post here on the forum. Some do that so they're forum posts match their in game name if it differs from the main VO account name. They just use the account for the forum.