What worse case scenario given then fact I have only 14$ on this wallet and of course not intend to deposit anymore funds to that wallet
why do you ask again when you find out that your wallet phrase is already in someone else's hands? it is clear that this person will have access to your wallet and at any time he can withdraw the assets in your wallet. i'm quite surprised that you know how to make a deposit, but even with basic knowledge like this you still can't understand it.