The rightful condition of freedom that a functioning state sustains is the freedom to act for any innocent purpose one chooses with one's body and whatever means one owns, along with the right not to be forced to act to serve the purposes of other people or to suffer one's property being used to serve the purposes of others.  Everyone has the same freedom, and others acting freely may bring it about that one's opportunity to achieve one's desires may be sharply curtailed. Other people's legitimate exercise of their freedom does not lessen your freedom in the relevant sense, even if their choices put you at a disadvantage or preclude your attaining any particular level of welfare or well-being. For example, others might purchase all the food at the store, leaving you with no opportunity to buy any. No matter, from the Kantian perspective. So long as you are not subject to the will of others, forced to serve their purposes in the absence of your voluntary agreement to do so, your equal freedom is neither reduced nor compromised.