I'm wondering if we had negative thoughts around a certain subject in the past, do they manifest, even if now I'm thinking more positive, and I'm much more confident? I know that I create my own reality and how other people treat me, but in the past, I had a bad experience and sometimes, this fear comes back that that bad experience can happen again... So in the last 6 months I had a thought about it here and there, but I was not really dwelling on it, it just popped into my mind, causing some anxiety. But often, this bad thought / feeling disappeared the next day.

So my question is: do I have to worry about these past negative thoughts? Will they manifest? Or shall I just ignore them?