I want to know what is the difference between what a seizure feels like and what passing out feels like?

Can be hard to tell. Seizures can be preceded by an "aura", a feeling that the seizure is coming. This could be a strange smell, taste, feeling, visual hallucination. Passing out is typically preceded by a feeling of lightheadness, and/or nausea, sweatiness. Dangerous causes of passing out have no warning. You will be doing something and bam, you wake up on the floor. Hope this helps.