I don't know of any journal that one could expect to accept "I don't like your journal any more" as a legitimate reason for retraction: a good journal would probably just scoff at you, while a crappy or predatory journal is unlikely to meaningfully respond to any request for retraction, no matter how legitimate.
Therefore, I don't think you should try to retract it, but simply to drown out your early mistakes over time with subsequent good work.
As for whether to leave it on your CV:
- If you have reason to believe that this journal is a sham that does not actually peer review, then I think that @NateEldredge is right: you can leave it off of your CV entirely or (better), move it to a section on published non-peer-reviewed work, much as you would list an arXiv publication.
- If the journal is simply crappy, however, I think you're stuck with it. You really did publish there, and no matter how crappy, it's still an archived journal publication.