Your problem is not that you lack confidence. Your problem is that you aren't interested in B.S. contests. Unfortunately these contests are often how managers

Your problem is not that you lack confidence. Your problem is that you aren't interested in B.S. contests. Unfortunately these contests are often how managers discern the natural leaders of a team and you are probably feeling the urge to prove yourself in some way. The good thing is that there are a million ways to earn some kind of distinction on a technical team. In an argument or competition, there can only be one winner. But engineering is a business and business is cooperative. If you show clear superiority in an area, then others on your team must follow your lead in that area.