No, i think you're experiencing doubts typical to anyone who is just barely starting out. One week is not enough time to make any judgement on your natural abilites or talents. Just compare it to anything you're started out with, let's say learning a new sport - football, for instance. If you had only been playing football for one week, you'd probably still stink pretty badly at it. Same thing for magic.
There's a lot of misinformation out there about magic. TONS of it. There's also a lot of people who fabricate and "color" their experiences, so an earnest person really believes that within a few weeks or months (or even years), they are able to move things with their minds, fight demon wars out on the astral, become a mermaid with a simple chant, and basically solve all of their life's problems with spellcraft. That's just not the case.
Proper study will take years, although it can be a lot of fun and certianly intersting. To be a beginner is not a dirty word in magic. In fact, most people who have been practicing for decades will still consider themselves a beginner. It's the people who call themselves experts that you should be wary of.
My advice - join one of the covens on this site or another that has curriculum for bare beginners and then learn everything with an open heart. Make sure the people running the covens are mature for you don't want to learn from beginners who hold themselves out as adepts - a common phenomenon.
Enough out of me... Best of luck!