Being a Christian is always a daily struggle. Whether its 2 weeks, 2 years or 20 years. Our minds and bodies and sinful and lean towards wanting or having a tendency to do wrong, while our spirit wants to do right. As Paul said 'i do what i do not want to do'.
You're talking about personal change, and thinking in two weeks you should magically change. Personal change doesn't happen in a few days. It takes years. There are things about myself i've been trying to change since i was a teen, and still have struggles with.
And yes, you are unworthy. We ALL are unworthy. That's what grace is all about. Grace is giving special favor or treatment to someone who doesn't deserve it. We're all sinners. We all struggle. The key is not to let the struggle affect you.
It helps to have a realistic view. If you have a strong friendship with someone, that friendship didn't get strong after 2 weeks. Those kinds of friendships take time to cultivate. And work. You have good days and bad days with that person, but you never give up on them. This is how you have to view your walk with God. The beginning of a new friendship, in a sense, one that takes time and work, having good days and bad.
Its understandable to feel a level of frustration and that you aren't doing good enough. But remember, our goal here is not perfection. Our goal is to know we do our best each day. But allow yourself to also walk in God's grace so that you don't allow satan to gain a foothold in your life and let guilt seep in. Just keep trying, doing your best, don't beat yourself up for not being where you want to be. Following God is a never ending thing. You strive to be at a certain level, but as you grow towards that level you find there are higher levels you want to reach. And it goes on and on like that. So just relax, thank God for His grace, keep reading and praying and living right and don't worry about the rest.