Discovered the Worldcraft editor after I got Half-Life Generations back on CD, and began tinkering with mapmaking from that point onwards. At least 10 years now. Made maps of my room/school, areas in my city etc. Made maps for timesplitters with the crappy prefab pieces...and slowly it snowballed into bigger things.
By the time I hit 16/17 I discovered actual modding teams, worked on a few shitty "newbie's first own hl2-related mod" called Downfall. Obvioulsy it never saw the light of day. This was around the time I was finishing High School...making full use of the printer in IT class to print off interlopers & The Snarkpit tutorials (I still have a folder of like 500 pages somewhere at my first home).
Used to be known as Chaffing_Weasel back then, I was a douche, but in time you gain maturity and two-way respect for the community kicks in. I eventually switched to my current lopers account 'TheHollowNight' in 2008 - which was the screen name for my music projects and it stuck for all things online - but everybody just calls me Hollow.
I started entering Interlopers design challenges occasionally and pimping maps here and there, never really released that much but seemed to have gained a reputation for a love of intricate detail & lighting. I eventually joined forces with Major Banter, another long serving Loper (plus a few others), to work on Field Zone (now morphed into Stroll). Though the mod was mis-managed, due to us being pretty young, it was a great learning experience, I got efficient at making textures and environment design.
I was loosely involved with S.T.T.R, funky/intriguing mod by peegee, did some music tests and level design feedback, yadda yadda.
I started getting a whiff of interest in a secret project some of the veteran Interlopers were working on, led by Tay (Or Kremator to most). It was CANVAS, a pretty substantial total conversion, and one that made a pretty decent impact beyond even the modding scene. I was highy inspired (and still am) by Tay's very bold imagery and design, sharing a lot of similar tastes in aesthetic and areas of influence. No surprises he used to win all of the Lopers design battles he entered into. I basically pestered the shit out of him until he let me join the team back in 2009 (?).
After we released the Canvas trailer, I started applying for industry jobs and struck lucky. Landed a Level Designer position on Forza Horizon. I continued to stay in touch with modding, working again with Tay and the rest of the remaining Canvas crew (who had recently merged with the City 17: Episode 1 dudes). We released Black Snow, which did pretty darn well in the Let's Play scene. I contributed to bits and bobs here and there, also branching out equally into environment art.
Which brings me to today, 24 years of age, still plugging away at many projects.
I am currently working on The Crew for PS4/XB1/PC, A CSGO map which I am looking to finish over the next few months (no, seriously).
And lastly, a very awesome indie project, that the Black Snow team have been working on for some time (We're now known as Monothetic), making this the 3rd major project I've worked on with some of the same peeps. I am super excited for this one

I can't stress enough how much this site has helped me grow as a creative individual, and how awesome it is to see many other community members now working on fantastic games in the industry or projects of their own. I really hope that the introduction of Source 2 injects a burst of life back into the site, because the last year or two has seen it slightly stagnate - not a fault of the community - making me drift over to Mapcore more occasionally (TRAITOR).
TL:DR - keep working on shit til you get lucky.