401(k) Millionaire

Affirmations dictate I will someday be a millionaire. USA Today published that Fidelity has a record number 401(k) millionaires. 
I probably think about my 401(k)s too frequently, but I want to retire one day. I'll 40 soon. I've had 401(k) at 5 different jobs. Usually, I worked part-time, so the 6-10% didn't amount to much upon my severing ties. $1,200 from Target. $1,200 from the hospital. $8,000 from the career college. $5,000 from the car wash. I've rolled those into an IRA at Fidelity. I'm not adding to it since my employer utilizes Vanguard, so I'm pretty conservative with my Fidelity stash. It's been up towards $20k and down towards $13k, which seems volatile rather than conservative, but I've a long view approach based on gold and high interest mutual funds with dividends.
Meanwhile, I'm attempting to max out contributions into my Vanguard account. At $18,500 a year for 25 years, I expect to be very close to my "goal" of being a millionaire. Probably won't be much given inflation, but it's a goal. Everything else I'm doing with my finances is systems based to make the 401(k) be viable means of retirement.