DevonCreamTea these people exist! I went to a state grammar school, so it was a mixed bag.
The posher kids, well spoken, with grandparents buying them their brand new first car on the 17th birthday, their parents paying for driving lessons, taxing, insuring, servicing and repairing it, giving them a petrol allowance each week, as well as a clothing allowance and a going out allowance, plus handing over money for anything else they needed on an ad-hoc basis. Fully funded through university, first job a fairly good one due to connections, not having to pay rent to live with their parents throughout their 20s and still being handed money on a regular basis despite working full time. Moved out when they'd saved a deposit for a mortgage.
There were people like me, parents with an average home, given £5/wk pocket money and with a £6/wk paper round. Able to help myself to whatever food was around, clothed with necessities and basic toiletries in the bathroom for everyone. Everything else I had to pay for with my own money. Left school, no encouragement to go to university and I was desperate for some freedom that a wage would bring, got a basic first job paying £2/hr, handed over a third of my wages to parents. We didn't have a phone in the house until I was 10, long after most I knew. Moved out into a rented houseshare, regularly moved jobs to increase my salary a bit.
Then a few like my friend, living in a 3bed council house with 5 siblings and parent/step parent. Cereal for breakfast, home made sandwiches for lunch and an evening meal if you were home for it. She didn't touch any other food without asking first. Working two jobs (one a few eves, one weekends) and apart from the food and school uniform, having to pay for everything else herself. The youngest child was 7 but they still owned a pram - to load up with shopping so they didn't have to carry it home, no car. The phone in her house had a slot for your 10p and was set up so when the other party picked up they couldn't hear you until you pressed the money in, it was the only way her mother could be certain of paying the phone bill. After working in the shop for 10yrs she was manager by her mid 20s and living in the flat above as a perk.
I can well imagine the first lot never learning to budget at all, depending on the path their lives took. Whereas people like me and my friend grew up with it.
OP one thing you might notice is not just feeling out of step with your friends but having to take measures to ensure they don't spend your money for you. Eg by borrowing something and forgetting to return it then losing it, meaning you've to buy another. Organising group events with no thought to money then presenting you with a bill for your share when it's too late to pull out. Stuff like that can seriously mess up your budget and if you were actually poor, could lead to financial disaster. In your case it'll probably just mean the frustration of being absolutely broke next month because you overspent this month, but even so, it's not something you can financially absorb every month. Beware the temptation to put everything on a credit card and worry about it later because you earn well. It's easy to get out of your depth. Or things don't go the way you planned in a year's time and now you're in the same situation only with a pile of debt, making everything so much harder.