Falling asleep!!?!

Falling asleep!!?

Please help! For the past few years I have been falling asleep ALOT, and i mean alot!!
Im only 20 so by rights I should be full of energy. I eat lots of fruit, veg and protein and am fairly active!
Usually im feeling fine then out of nowhere it happens!!! I could be sitting watching a film or even talking to someone and all of a sudden I find myself waking up. It happened me last week on a work training course and has even happened a couple of times when iv been driving!
I usually don't feel myself falling asleep. Sometimes I do and fight it as hard as I can but its no use!
It can be really embarrassing and has caused alot of tension in my relationship. Understandably my boyfriend finds it irratating, but he doesn't seem to understand that I cant help it.
I have tried drinking coffee, taking energy pills and getting up and walking around when I feel it happening but nothing seems to work!!
I know its really complicated but does anyone have any idea what might be wrong with me??

bummer! sounds like a form of narcolepsy or you may be having absence seizures (a form of epilepsy). see your primary and get a referral to see a neurologist. good luck!