I see no reason to say NO. Anyone who tells you that this is impossible is either just mocking you or doesn't understand or is lying.
It is possible to start a career with freerolls, and I would even say it is correct. The fact that you start your career with freerolls does not mean that you will not end with them
It is possible,I have never made a deposit and I have been playing poker for almost twenty years.I buildt my bankroll and got experience playing using freerolls and it has been a great poker journey and it still is.Pot odds I learned from Dan Harringtons poker books, It will help you win in the long run and deal wit statistical fluctuations like bad beats.