So I thought by getting a 105 11-speed 11-28 cassette I could convert it to 11 speed easily. Logically I thought it would be feasible since it is also 11-28 like my current cassette but mechanically I was told it cannot be done. I want to upgrade the front Derailleur to 105 as well as the Crankset.
What 105 components do I need to get to make these upgrades, and if not possible can someone explain why?
...I'd suggest you ask yourself what is your purpose in going from 10 to 11 on the rear. For the great majority of riders, it's not an especially functional "upgrade". Mostly, whoever told you that it was mechanically "impossible" looked at your bike, did a quick mental calculation of the cost of parts and labor involved to make the switch, and gave you some good advice. They should probably have used the word "impractical", rather than "impossible". Impossible always tends to set people off on quests.
There's an unfortunate tendency in the world of bicycle to equate more with better in the realm of rear cogs. I'm unconvinced.