It wasn't you who said those words really. You were under the influence that inspired you to think and do certain things. It's a form of channeling you could say. Such thoughts wouldn't enter your mind if you were under the influence of angelic grace.
When you surrender to that influence and allow it to manifest through you, it does indeed enter deeper into your psych and from there its influence becomes more prominent. But the good thing is you can change company any time you want and there's nothing light cannot replace. You might even help the dark entities with the process of ascension as you illuminate your own psyche. Although convincing someone who's under the dark influence to turn to light can take a long time. The solution is simple but reluctance to apply it can take lifetimes.
Btw, you're not even the only one like that. Probably 100% of the people conciously or unconsciously were under that influence at least once in their life. It's like a virus in the air. It's not a big deal as long as your immunity is okay.