Notion and fact are completely different. That notion that you have of something is not a fact.
Notion is just a perspective not the actual situation or actual event.
The idea you have in your mind is just your idea, not a fact. And your feeling is also not true to the outer world; it’s just your feeling.
The word “notion” is just an exaggeration when we explain it to the real world. We shouldn’t confuse these two words.