If I have an American Express gift card, am I able to change the card into actual cash?
It IS actual cash. Now go out and spend it. It is safer than cash.
No. Just ask your parents or an older relative if they could give you the amount of cash the card has because you'd rather have the money and they could use the card for anything. It's fair
NO. and it is not accepted at most retailers
Any place that accepts American Express might be able to give you 'cash back'. You'll have to ask.
No you cannot.