In my past, I did a couple of awful things that I regret today and feel totally disgusted by. I wouldn’t do them again, but reflecting on those actions, I felt disgust for those who commit them today and instantly felt like a hypocrite. Although I said I wouldn’t do it again, the past is still there, and the demons, as well as other entities, with whom I want to work can see it. I know they don’t have the same morals as we do, but even so, it’s clear that there are things they don’t like. I mean, you wouldn’t go and introduce yourself to Lilith if you were a sexist, right?
That’s not my case, it was just an example.
But anyway, that’s my question: Will I be judged and reproached for my past even though I’ve changed? Maybe they’ll impose some punishment on me, and I accept that, but I don’t want to be deprived of their help because of my past mistakes.
No. They will be please that you have grown out of it. The Christians call this “repentance” and when it’s true and heartfelt (not a fake apology in a confessional, which spiritually doesn’t count) then you are forgiven, even if you cannot forgive yourself.
Yes and No. It depends what you think a Demon is. Reasoning in your head won’t always make a danger go away if it is a danger. It depends on what you did, because it creates a sort of energetic karma in your aura. On the deeper Source levels you cannot simply just clean your aura to get rid of it, but have to work through it. It will definetely make you more vulnerable to people of similar energetic signature as well as curses (takes a bite out of a juicy green apple).
You speak of these entities as if they are real people, or real people who use these entities. In that case, its a realistic probability.