You asked me earlier about me being full time prior to age 32. I went to Riddle back in 90-94, got out and ended up in the Navy working on computers for 9 years.
I turned 30 with 200TT and got my first job in aviation when my wife got me a skydive certificate. I was joking around with the owner and asked if he needed a pilot. He said, "Come talk to me afterwards." My first true job in aviation was with meat missiles. I was full time Navy, part time skydive pilot, and working on my CFI. I ended up instructing more than throwing meat missiles, but still did it part time.
Why did I wait until 30 to get my CFI? Because, just like you, I didn't think instructing was for me. Since then, I have had 2 "full time" CFI jobs, 1 part time CFI job (weekends, while still full time Navy, and weekdays "full time" at another school), 2 part time meat missile jobs, did aerial survey for a season, and then went on to Airnet. I am now a Captain on a G-450 flying out of Moscow.
You may be set on the 777, but I was set on flying for American Airlines. I interned with them, and AA was in my blood. Now, you couldn't pay me enough to go to an airline. Plus, airlines don't pay that well anymore. You also get bankruptcies, etc. Yes, corporate aviation has the same problems, but my time overseas and time flying jets actually gets me some where, unlike the airlines and the seniority system.
YMMV, but yes, I was pretty much exactly where you are.