That's one great question and quite a story I guess. First login was during halloween 2012. Three years later I had to retake an entire year of school. I got actual friends after that, my previous ones all left school. I still keep in touch with them and plan to keep on doing that, even though most of them are currently studying.Three years after that I had to retake another year. After this, I switched my entire future career path, from a tech-oriented one towards a more social-oriented one and I am currently planning to study tax law next year.
Three years ago, nearing the end of first time fifth grade, a switch flipped in my head and I started paying attention to what my teachers said in class. My grades have quite greatly improved since then. I passed both my FCE and CAE English exams with an A+ during this time.
I went through puberty, which in and of itself greatly changes you and your perception of the world.
I spammed the forums for nearly two years, after which I became quite inactive (most of my 2300 posts of mine date back nearly 3 years now) after realizing just how much of an obnoxious asshole I was.
My taste in music went from this weird indie-hipster genre, all the way through country to synthwave and currently progressive house.
My taste in gaming also changed a lot: I played Warspear for nearly three years straight during 2012-2015 and I have some memories I am quite fond of during that time. After that my attention shifted to Planetside 2, an obscure MMOFPS for 2 years, along with SWTOR during that time. My Steam library has grown quite some and I now mostly play grand strategy games (EU IV and Stellaris). I now log on every day for that 100-day achievement, previous run failed at day 88.
Overall, I'd say I have matured quite some, but not nearly as much as I expected I would have. However, I'm happy and that's what's important.
The changes between the road networks of The Netherlands and Belgium are staggering: Dutch roads are well maintained, but as soon as you cross the border with Belgium, it's like you are driving through, with all due respect, some backwards shithole. The essence here is that there are massive differences between different countries regarding stuff we take for granted. Have you got similar experiences when crossing your state's or province's borders? Keep in mind that this doesn't necessarily apply to my example above.