I Am A Christian But Im Not Perfect

Lord I sinned once again, for that instant gratification but after I was filled with sorrow. And I wonder to myself is this who I truly am, and I can't help but to think yes...it must be because it is continues, then I realize that it's not who God wants me to be so once again I repent....I just hope that I can conquer this for good, and not have it in my nature.