How to convert Visa Gift Cards into something useful

I live with my parents so I don't pay rent or buy groceries right now. As far as I can tell there is no way to convert the gift cards into money (into my bank account). I can't add them to Amazon or PayPal or use them to pay off any debt.

Is my only option to literally keep track of how much is left on these gift cards everytime I go out? I have like $550 in gift cards from work that I have received over the last 2 years and never used.