But what does it mean when people say my Canon Shep? Is it the ideal, real Shepard with the perfect playthrough? Cause I personally only have one FemShep
Well, some people do play different "Shepards". This time romance that one, that time - another, this time - make perfect suicide mission - next time play it bad. This time be earthborn soldier, next - spacer biotic. "Canon Shep" is one, which had some "best" playthrough, with professsion, set of choices and romances that player considers fit "his\\her" Shep right.
I may give you an example - I lost Tali on my first suicide mission, and my own "canon Shep" had no Tali in ME3. On another 1-3 run I thought I'd like to try perfect run and to bring peace to geth\\quarians. Which I did, but which did not change the fact that my "canon Shep" has geth dead long before destroy. In rest part those 1-3 were very close for me(and with same name, face and class), though. I can not imagine my femshep with, lets say, Liara or Garrus and I'm not renegade type. And I like her as engineer. Probablly, I may try broshep one day, but I rarely play male chars, I prefer keeping my own gender.
I tried once to save Ash on Virmire and... I just couldn't do it!!!
few of us could, I think, and those who did - regreted heavily...just in few minutes, and reloaded. I can't even set Kaidan to defend salarians, I keep him by my side right up to the bomb. As if I could miss the chance to save him at the tower...
What nationality are you may I ask? Tu n'es pas français(e) par hasard ? 
I studied some languages, but french is out of the list, sorry. Though I can recognize few words if I try hard to. Wonder did you take me for french or canadian? 8P Both are wrong anyway, not even close. I'm from Russia.