I am a 20 year old male. Lately (over the last few months), I have been feeling incredibly restless making hard to study and causing me to lose interest in girls. I feel like I want to stand up grab a sword and help conquer a castle, get locked in a battle or struggle of some sort, or just participate in an adventure of some sort like those in movies or books. I just don't want to be sitting studying, I want to feel adrenaline, danger. This feeling has hit me suddenly and is not subsiding. Is this an inner game issue? What can I do to improve? What is the cause?

Not sure if this is the correct place to post it. Forgive my transgression if it isn't.