No, I do not have to do that. I can also work for myself. Also, nothing stops me from starting a company of equal partners who part-take in every decision and do the same work.
That is the point I am trying to make, its the capitalist that needs other people to produce things, him alone can't do shit... its the other workers that he needs to make him rich.
Often the company does big jobs that the workers individually cannot do. That means mutual dependency instead of one-way dependency that you pretend is the only state.