I would like to answer Jewcy's question too if I may.
And my answer, after a little thought, is no, I do not feel unworthy.
And I think it is because, at the back of my mind,I know He rescues the unworthy.
So I know, that even if my faith went back a bit, or stood still for a bit, that as long as I never throw it away, I am still saved. And that is just fine with me.
And this is the important bit. When you are saved, ALL your past sins, absolutely all of them are washed away, They are no more.They are finished. In fact, God has forgotten them. So you start from absolutely brand new.
Now as to people's sins after they become a Christian. Yes we sin. But if we say sorry for them, they are all gone again. [obviously we shouldnt keep sinning and just think, well that is ok, I will say sorry and God will forgive. Yes he will, but something is going rather fundementally wrong imo for that to keep happening].
And, lastly, God has chosen to save you, Jewcy, yes you. So, who are you or us or anyone around you to say you are not worth it, when God clearly thinks you are.