I am not sure how old you are, but have you never been taught that it's often less what you know than WHO you know? I was taught this from 12 years of age, possibly earlier, and found it very true. it's probably not PC to say such things now, hence the surprise (probably faux) when that advice transpires to be accurate.
I never went to a public school, but I have slowly made sure that I can ring a doctor, a solicitor, a barrister, a dentist, my MP, several local councillors, a vet and an "imaginative" accountant all out of office hours and call them by their first name and get basic immediate advice. I don't "use" my friendships, but I do value its potential in aiding me in life. Less high brow friends of course have their value, be it in how to catch moles, lay a hedge, or even dig an accurate and mess free hole for a gate post.
I don't know any "bloggers", pop stars, or political activists, nor the names of any well known PC gamers or their games. If I thought any of these would make useful acquaintances I am sure I could find a way into their circles, but I can't see me going out of my way there
I can only envy those who were lucky enough to attend a public school, and who they have in their address books and can call friends! Most public schools now offer a number of free places each year if the fees are too great, as they are of course for many....