Am I A Sensitive?

Here's the thing I'm young and I have these feelings. Put it this way when I was about eight years old my grandfather died and I didn't know until I got home I was at daycare and I said to my friend " my stomach doesn't feel right" and she suggested telling someone so I could take medicine to make the stomach ache go away. And I said " no it isn't a stomach ache I've never felt this before it is in the middle of my stomach" and I remember it wasn't a feeling I just felt overwhelmed with sadness but only in my stomach I know it sounds weird but it's hard to explain the feeling that I had but I never felt this before and it felt very wrong and when I got home my dad called and said that my grandfather had gotten sick and passed away that day and I never thought anything of it until a few years later when I started feeling like someone was watching me and I would go really still sometimes or I would stare off looking at something little like license plate on a car but still realize and be aware of everything going on around me and there has been one other time I've gotten that feeling of something being very wrong in the pit of my stomach and I was with I think my parents and we were somewhere and I said something didn't feel right and I had that feeling in the pit of my stomach that something was wrong and I felt like something was wrong I can't remember where I was but I do remember saying that and feeling that but I don't want a reading and it has been suggested from a friend that I may be a sensitive am I or am I going crazy? I need to know if I am sensitive going crazy or paranoid because if it isn't me being sensitive, then I'm either really paranoid, or I'm going crazy because what I just told you I would not classify as normal.