Frustrating thing to deal with, but it can change!
You’ve ‘diagnosed’ the issue as a possible body language or confidence issue. My personal experience suggests it may be both A. Do you truly see yourself as authentically confident, a leader, someone with authority? Or are you trying to convince yourself that you are the above…? B. First impressions, Charisma, Presence, Effective Body language all play a huge part in what you are struggling with as well.
My thoughts would be to first ask yourself a hard question … “Do I really see myself as a leader?” Why / why not?
Vanessa has several course on Udemy / Creative Live that help to address this.
Have a look at this link: