My first website was back in 2005/6ish on a platform called FreeWebs. I was doing GCSE IT at the time and our whole class was obsessed with MiniClip and Flash based browser games.
I embedded a few games on a free website for personal use – giving me an early exposure to Javascript, iFrames and pesky widget links…which I soon worked out how to remove. Even then instinctively knew they were dirty.
I didn’t really build any actual websites though until many years later in 2012 after placement year.