Dear Ewat,
Whenever someone has paralysis or weakness in their facial movement, the first thing is to rule out the possiblity of stroke. While stroke is more common in older folks, it can happen in the young, particularly if they are smokers or are on the birth control pill. Usually, however, the symptoms of stroke occur suddenly and you say that your symptoms have been present for as long as you can remember, so it is likely that something else is causing your symptoms.