Can the way you hold your body or move, have measurable affects on how you feel? Absolutely and Dr. Amy Cuddy has research to back it up. Dr. Cuddy is social psychologist, teaches at the Harvard Business School, and studies our perceptions of others and how others influence us.
Fake it until you make it works and there is evidence to back it up as a useful strategy (for more details see “Power Postures Can Make You Feel More Powerful” (WIRED Science, May 15, 2012.)
The first video is a five minute overview and the second video is a 17 minute presentation about the idea that we can change our feelings about our own status by changing the positions of our bodies.