Who is my Master

DEVOTION
ROMANS
WHO IS MY MASTER
Rom 6:5-7
5 If we have been united with him like this in his death, we will certainly also be united with him in his resurrection. 6 For we know that our old self was crucified with him so that the body of sin might be done away with, that we should no longer be slaves to sin— 7 because anyone who has died has been freed from sin. NIV
How many times can I ask myself this question? How many times within the context of this chapter 6 of Romans can I see the principle which defines how I am to approach my relationship with Christ and the result it is suppose to produce? Can I not simply serve myself, or must I either choose to serve sin or Christ? Is serving myself serving sin? I think so, therefore I must choose to do away with self in order to serve Christ and therefore be freed from sin. I must be united with him in a way that is like his death, that is, I must think of myself as being dead, I am, the person who served sin, no longer alive, and if that is true I certainly cannot serve a dead man, can I? But I also am united with him in his resurrection, a new me, a glorified me, a different form of me, a form of me that has been freed from the old form of me who was a slave to sin. So then I have to ask myself, if I have been freed from that old self, that old form of me who was a slave to sin, why then do I still find myself engaged in some form of sin? Why have I not become a perfect human being, in the exact same form as Christ, who I am united with? If my old self was crucified, died and was buried then am I a grave robber? Have I resurrected that old self? Or is all this metaphorical and both forms of me still actually exist within and thus that war which wages within is the result of me arguing with myself as to which master I will serve?