you must be 21 to drink alcohol
yes
underage drinking
Is possession of alcohol considered a felony or misdemeanor?
No it is not legal.
No
In most states, a underage person cannot be at a party where alcohol is being served. This goes for anyone who is drinking or not.
Maybe you like the taste, but can't drink alcohol. (underage, pregnant)
No, you can be charged with underage use.
No.
No it is a misdemeanor in the state of Mississippi.
Nope, Alcohol only affects you if you're over 18 (or 21 in some jurisdictions).