if you're energetic from coffee, that means you have an abundance of energy to begin with. Coffee (caffeine more specifically) prevents you from being tired, hence why it's used to wake you up. It binds with the adenosine receptors, which are normally used for making us feel tired. Blocking that tired feeling doesn't give you energy on its own so if caffeine makes you hyper, then you were always hyper. Just an FYI so you understand why coffee does that to you.