It is soooo hard to find the positive sometimes, but finding the positive will help motivate you. Why did you originally volunteer to help the youngsters? Certainly to do something good, to give back, to help. A lot of times in helping others we help ourselves. If you can maybe think of the positive you'll be doing, then pick up the phone and call them while there is still positiveness (new word, just invented!) in your mind, maybe that will get you over that first step. Regarding the job, it's not unusual to feel what you're feeling (ok, not unusual for me anyway); even positive change is change and change is scary. Whenever I think about my job being in jeopardy and the possibility of having to go on interviews and meet new people I throw up. The negatives of "I'll screw up the interview, I'll stumble over my words, I'm not pretty enough, thin enough, blah blah blah" start coming in. Honestly, hon, the way I've gotten through every tough interview is to think, "if I mess up, if I don't get the job, if they don't like me, what will happen?" Remember, too, that as much as
they are interviewing
you, you are also interviewing them. So that puts
you in charge; if you aren't comfortable, get up leave, it's ok. I'm rambling here, but trying to impart things that have helped over my years. Oh, and take chocolate. Not for them, but for you for afterwards. If the interview went well, to celebrate; if not, then for comfort. (hmm, think I have some eating-for-comfort issues?

). Seriously, though, you
can do it. And if this interview doesn't go how you want, you will get more. Everything happens for a reason and if it doesn't go well, you weren't meant for it!
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"We can't talk at the same time! It doesn't work like that! I talk, you talk, I talk, you talk!!" ~ Peanut