How Do I Motivate my subordinates when I am Demotivated?

     Ok so I went for a Leadership training the other day and instead of feeling motivated (as I was during training), i felt totally demotivated by the end of it. Why? Well, because I was asked to explain about my member's recruitment achievement (which didn't hit the target given by my Headquarters) and of course I could go on and on saying that I don't have enough staffs, I have two departments to take care of at once (mind you, I am not the Buddha with a lot of hands), and all sorts, but knowing HQ, I know for sure they're not going to accept my answer.
    So instead, I honestly answered that probably my selling skills were not right (The thing i'm selling is my company's member's card). So flash forward to the next day which was yesterday, the HQ boss of mine came over for another evaluation and well I know he's not satisfied with my performance. I don't know what else to say to him; "I can't do sales job! I was never good at sales and never will be!"
     But even I know that is not the right way, because people always say, you can't say no, you gotta always say yeah and stuff, but I've been saying yeah for almost two years now, and come on, let's be realistic, I am not cut out to do sales. That's the reason I bypass any jobs in any classified that has the word sales on it, regardless of how high they may pay. I signed up for this job because I like to talk to people (as in deal with customer issues and stuffs), but I don't want to sell things to them. I'm now like the people I avoid in shopping complexes who come up to us saying, "miss do you want to try this and that, we're having a promotion now."
    The rejection is killing me slowly. Still I try, but i guess it's not enough. I don't know what else to do. Thus i get back to my topic, how do i Motivate others when I am demotivated? I know for a fact that motivation has to come from within myself, but we sometimes need a little prod in the right direction. I am supposed to come up with pep-talks and motivational encouragement to my sub-ordinates to make them sell our membership too, but how do I do that when I don't even belief in myself?
     I can't go ahead and say, "You guys can do it if you believe, because i know you can," when deep inside i'm thinking, "I can't do this anymore." Won't I sound like all those hypocrites i despise? *Sighs*
     I downloaded some motivational quotes using my phone, to help me motivate myself. Rationally I've got to motivate myself first before I go around preaching to others, right?
     Say as you do, and do as you say, am I right?