In Germany, as in most enlightened countries, there is a very low, if any, minimum age for alcoholic beverages. Some have no restriction on beer and wine.
Even New York State used to have a minimum age of 18 until the Federal Government said something about requiring a minimum age of 21 or the state would not get road construction funds.
Now that those laws are settled, the law in the State of Florida is 21 years old. There is no legal extraterritoriality at WDW, so those laws do apply.
If you are with your parents and not conspicuous about it, they might allow you a sip of their beer or wine for a taste. However, it is still not legal.