Confidence is a people characteristic that many claim to want more of. They see others who appear very confident. They sell, buy, trade, get the job, get the promotion, get the raise, they get-get-get and take-take-take. There is something about them that is different, it may be charisma, their posture, or something we call presence, but it probably begins with their mindset.
Confidence is a product of two primary factors, self-esteem and self-efficacy; and both can be built or destroyed, but it is your choice. People can be difficult, critical, and often uncaring. They seldom consider the consequences of their actions and behaviors before they find a way to tear you down, break you down, and make you feel like they are trying to keep you down.
Their influence, or not, is a choice, your choice.
It is up to you, choose their mindset or choose yours.
Choose self esteem.