The purpose of my experiment is to study the difference between currency and general goods/services, not from a user perspective, but rather from a currency maker perspective (why making currency is different than making other general goods/services)
There is no functional difference. A currency is simply the good that is accepted by everyone in exchange for their goods or services.
1. Currency will never get consumed, so they will not disappear from the economy. General goods/services will get consumed and disappear from circulation, so they need to be produced continuously
That actually depends on the currency. Gold, for instance, slowly gets rubbed/abraded away. The US Dollar, being made mostly of paper, is subject to some pretty serious wear, such that the average lifespan of an individual bill is less than two years. Gold, therefore needs to be re-minted, and dollars shredded and re-printed.
2. The currency depreciate slowly while general goods/services depreciate quickly, so the currency works as a store of value. This is maybe the most important difference, anything with value that lasts longer than currency should be able to work as a currency to exchange value (gold is such a good currency since it almost never depreciate, while silver is not so stable, could be oxidized)
An oxidized silver coin is still silver, and still holds value. Additionally, a currency does need to be a good store of value, but that's only one necessary feature.
3. The economy activities are driven by currency, not demand. People have all sorts of demand, but unless they get currency first, they will not easily get their demand fulfilled, even others have the product they want, their product might not interest others. In today's society most of the goods/services can only be purchased with currency, not through barter. This had some influence on people's behavior, they use the currency as a standard measurement of value.
And this is just plain wrong. Economic activity is not driven by money. It's made easier by money, but it's driven by demand. What you have to realize is that even if you're buying something with money, you're still using barter. Money is just a universally accepted barter good.