Let your body occupy little space in order to feel less confident and signal lack of status, thus compensating for typical but unfortunate human tendencies to think much more highly of their opinions than is actually justifiable and to prop up ubiquitous and costly signaling games. Harness the power of negative thinking!
It's not informative to send different signals than other people would send in your situation. You are proposing sending dishonest signals, which is uncooperative.
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.