Why can't I hold all these freedoms?
Could you define what you see as 'Communism', please?
The reason freedom doesn't work in communism is exactly as I described, earlier.
How many girls want to become an actress?
In an ideal communist society, they could become an actress and have everything they need to live.
In a realistic communist society, there are not enough hair stylists to take care of the actresses, enough waitresses to feed the crowds of spectators, and far too many bar tenders trying to pick up on actresses.
In order to get around this, one must set up a sort of planned economy. You set a quota for how many workers of each variety are needed for a given population size, and you 'lock' people into a range of jobs they can fill (and fill those jobs according to the needs of the nation).
This is precisely how the military works. "Needs of the Navy" is the ultimate clause in your contract that means you will serve when and where they need you. If you're an especially adept person when you enlist - you get treated fairly well (they let you pick what you want to do - because they want people who will become technical experts in the field and serve a long tour of duty in that capacity); if you're average... you fill out a dream sheet and find out where a computer places you.
It doesn't work nearly as well as its proponents like to think. You get paid the same whether you put pride and professionalism into your work, or not. True - time in rate and promotions tend to go to those who work hard... but they also go to those with a good set of knee-pads. Further complicating the issue is that people will be promoted simply by virtue of "we need more people of a higher rank." I have, literally, seen people advanced to the next highest rank and pay-grade because they filled out their name correctly on the exam portion of the advancement process. They were among the lowest scoring percentiles the previous three advancement cycles and don't contribute much to the overall productivity of the unit.
I've seen entire shops over-report their man-hours and fluff some paperwork to make it look like they are working far more dilligently than they are. They get rewarded with additional manpower (because the paperwork says they are swamped). In reality, they are kicking it in the A/C and making up virtually every number they put into systems like NALCOMIS/OOMA - which are attempts at better oversight, but realistically fail with the lack of strong business-minded Staff and Senior NCOs (and officer ranks).
Then you run into troubles with introducing new innovations.
Who gets access to the next iPhone, first? Or does commu-Apple need to run up an inventory large enough to service the whole population?
Who gets 4G service first?
If I come out with a computer that uses an interface A, and someone else comes out with an interface B, and yet another with interface C... what motive do I have to conform to interface C if I get paid the same regardless of how well my computers sell (because most monitors are using interface C)?
That's where communism works on the small tribal structure levels. What is produced and consumed is done so within a tightly knit social unit that can adequately monitor each other for abuse of the system... and what is produced in the community is intended only for use within that community (and perhaps a few travelers passing through - and there would usually be a bartering process involved for such things - even if, in the olden days, information/news was the commodity exchanged) - it's unlikely that you're going to have three different blacksmiths producing assemblies that are mutually incompatible with each other. If someone was being the belligerant, they'd probably find the carpenter less willing to work on their home and the farmers a little more guarded about how much his family was consuming.
Communism falls apart on the larger scale of things. It is too easy for people to utilize the benefit of the doubt to prey upon the system. Which is why bartering has always been the natural system of exchange when dealing with people outside of your immediate social network.