Yeah, dude, sounds like you lean more on the introverted side in that you probably don't have a problem socializing but it does drain you. Up until just a few months ago I leaned more on the introverted side, but recently I've found I'm a lot more split down the middle,and I can totally relate.
The thing I try to do now is play to my strengths when it comes to conversations; I absolutely hate cut and dry small talk bullshit so I try to steer clear and cut threads touching on "small talk." I also really enjoy talking to people about what it is they love, what problems they're overcoming, etc. and I try to pull out their passion - when I successfully do that I find myself never running out of energy. So, my advice is identify what your strengths are and utilize them as much as you can in conversations.
Frame battles and intense focus really isn't necessary when it comes to conversations and socializing, in my opinion anyway. Also, you shouldn't have to "find" self-directed energy, when you're having a conversation you enjoy the energy is just there; it's the difference between motivation and inspiration.
-Richard