You can absolutely dedicate yourself to your path and to the god(s). That is a contract between you and the Powers That Be. That said, you can't initiate yourself. Initiation is an introduction to the Mysteries done is a specific way, usually involving a challenge that the initiate must meet or overcome. This must be performed by someone who has her/himself already been initiated, and knows how to perform it for that tradition. "Self initiation" is a conflict in terms. I'm not placing a value judgment here, dedication and initiation are just different processes that achieve different spiritual goals. I'd point out that later editions of Scott Cunningham's book for Solitaries were changed by the publisher to say "self dedication" rather than self initiation.
To complicate things, I personally believe that the gods themselves will occasionally initiate someone. But that's unverifiable, and it's only valid to that individual. It's what we call an Unverifiable Personal Gnosis, and one cannot reasonably expect that others will accept it.
This controversy has been raging for years. If you DO decide to do a self initiation, think of it as a personal achievement and don't take offense if many in the Wiccan community don't see it as valid.
