I am in my mid 30s and remember 2002 clearly. Here's a snapshot:

The Internet was around but streaming video really wasn't. Being able to find everything on YouTube and stream it instantly is a big change today.

Physical media was required to watch anything (outside of television, cable TV, or movie theater), so that meant buying or renting a VHS or DVD (not in HD).

Scheduled TV shows were still a big deal. You couldn't watch on your own schedule. Recording shows became easier with things like Tivo, but that wasn't mainstream in 2002. Recording anything on TV still meant a VCR / VHS tape (bad SD quality and like an hour maximum.)

If you wanted to follow a popular show, you had to watch it at its time slot or you missed it until a Rerun. ("Don't miss CSI, Tuesday at 9 Eastern only on CBS!") Primetime television still mattered to people.

Internet speed was dramatically slower. But there were still many good websites, for almost any topic you could usually find good resources online. Many people still only accessed the Internet at the local library or net cafes, and it wasn't uncommon for someone to go days not logging online.

Web shopping was just beginning to be accepted as safe. Amazon was still seen as a niche site mainly for books. EBay was very popular, but people still mailed physical paper money orders for items. It was slower.

The idea of ordering almost everything online and having it arrive next day wasn't around, although this was predicted as the way it would go.

Cell phones were far, far more basic. No smartphones but we had basic texting. People talked on phones far more, but minutes and per-text charges were a concern.

Kids and teenagers didn't all have cell phones the way they do now. It was common for young people not to have their own phone until they were of driving age, and then it was more to have in case of emergency. Many people kept their cell phones literally turned off most of the time.

Home phones / landlines were still everywhere. You memorized important phone numbers.

Cars were about the same, really. Today we have more nav systems and touch screens but a 2000 car is perfectly usable and about the same.

Car GPS was far less common then. Road trips or even just driving places was a bit more challenging, services like MapQuest existed but you often printed turn by turn directions onto paper and had to follow along during the drive. This seems archaic now.

There were nav systems like Garmin and Magellan but they were seen as "fancy / expensive" and still pretty rare.

Drones! These were not around. The average person or even tech enthusiast in 2002 still saw drones as sci-fi / Star Wars-y. The motors, sensors, computers, and batteries weren't good enough yet. Military drones got attention because of Afghanistan but these were huge and still fairly classified.

We didn't think drones would just be flying around like normal in the near future, this wasn't on anybody's radar. The idea that you could just buy a quadracopter able to hover, stabilize itself, take video, and avoid obstacles was seen as some far-future Terminator stuff.

Overall, life was mostly the same really, just far less "always online." Nobody had the Internet in their pockets yet. People's "spheres" or worlds were smaller.

I'd say smartphones, drones, and always-on, streaming Internet and video are the biggest changes.