Saaaame. Been using Mint almost exclusively for 5-10 yrs and i still feel like im playing in the wading pool of what u can do with it. I learn more as I need to, and generally enjoy that process. I always feel super satisfied with myself when i use the terminal, even if its sudo apt-get install Firefox.
Whenever I need to do something, I'll figure it out. Sometimes it's a pain, like getting VNC to work. But then I'll write down the most important bits and duly forget the rest. I just want this stuff to work.