"Confidence" means hardly anything. Most people are confident in themselves to a certain extent.
It's like saying, to pass a test, you just have to be "confident". That doesn't mean jack shyt. Knowing the material will get you the pass and if you are well versed in the content and practiced whatever the test is on, you will be confident
Its unlikey a breh with 0 people skills will pull any dimes even with confidence unless he gets more experience by actively making an attempt to talk to women and picking up on cues, bringing the energy, etc.
It's unlikely a really out of shape breh is pulling any dimes without working on their stature etc.
Also "be confident" generic advice that is easy to give.