Many years ago I had a job working for a big corporate in N London. I went on an in-house training course for public speaking or similar, and one of the, other attendees had a work experience student with him. We all had to give a talk on a subject of our choice, more or less on the hoof. The facilitator asked the student, who must have been about 15 if he would like to speak. Most 15 years olds would have died on the spot, but this boy went to Harrow School. He stood up and gave a polished, interesting and self-deprecating speech about life at the school, when asked what happened if students weren't making the grades he commented that (with an eyeroll) their parents would just pay for a new science lab and it would all be sorted. He, no doubt, will have gone far, very likely via Oxbridge, he was charming and at ease throughout. It's by no means automatic, but very, very much easier for some than others.