I really want to lose around 20 lbs by the end of the summer. Does this sound like a good plan?

God you're already skinny! Seriously, I was expecting like a really fat picture! OK, you could probably tone up your stomach though, to be brutally honest, but only if you feel you need to, it doesn't look bad at all. And if you're going to tone your stomach, try aerobics cles because they really do work and make you fitter too.