Before, Lucifer to you was a crazed villain, much like The Joker. But that was your naive understanding as a child (Peter Pan) that was told that by adults. But your adult self, now in "the future" you must face down Lucifer for what it really is. All this clutter of a scared, ADHD mind is filling your brain like a landfill like in your other dream!
That you freaked out after listening to Crazy Train.... isn't that you sold your soul, it's that you are still on the crazy train ever since that night... the crazy train of centuries of cultural and religious baggage. Why feel so bad? Crazy Train is about some stuff that happened in Ozzy's life... nothing to do with the devil.
But you made it about that because of the religious baggage.. You felt guilty for listening to Rock N' Roll and all that... but really it isn't so bad, and you don't need to follow Satan/devil/Lucifer for that. Just be yourself, work out your anxiety and fears about it.
We all make up stories from our cultures about good guys, bad guys, particularly with religion. But it only has as much reality as you allow it. Please, don't let this reality become too real if this isn't a joke, since it seems to have a very negative effect on you (believe in Christianity and the Devil and selling souls). If that means just trying to stop believing it all that is probably best, but failing that and you wanting to keep your religion, then just work out that it's just a fear and nothing more, since you can't sell your soul like that and the devil can't really buy it anyway, just make you think you sold it. Not that I think he buys souls or really even exists anyway (the Devil that is, as a distinct idea from "Satan".)