I don't think it's nostalgia, I think you just have very clear memories of a time when things were "better".
Your early teens would have been during the golden eara of free credit, the country was awash with money and jobs, we had the Internet and mobiles, but not social media, ot the toxic elements of the technology.
We are heading into the abyss in terms of tech having a largely positive effect on our lives, now it's used as regressive, coercive control measure. We gave away our privacy and our autonomy. Very soon everything you buy will be logged and the data stored, every single penny that moves through your accounts will be available for scrutiny by the authorities. Every message you send, every email, every text, every Internet search will be available to the police and other government agencies to look at.
Smart meters will record when you make a cup of tea, your car will send a log of your movements to the manufacturer, who will store it and make it available to the authorities on request. They are now even putting cameras inside your new car to record your face as you drive.
"Connected" vehicles will all have a remote shut off "switch", which can be activated by the manufacturers, currently the US Government is passing a bill which will force car makers there to allow Police and other agencies to access this tech so that they can shut down those vehicles themselves, they say its for "safety" to stop stolen vehicles and to help combat terrorism, but we all know what it really means. The government now has the ability to literally turn off the ignition on your car to stop you going anywhere. It won't be long before Geo Fencing will be used (they will say its for environmental reasons) to stop you driving during particular times or through specified areas.
The world you knew is never coming back, no wonder you feel sad.