Does My Culture Have Anything To Do With What I See?

I am 14 years old (female) and all my life I have been seeing things before they happen. Usually when something really bad is going to happen I will have really bad nightmares about the situation, and they are super detailed. When I wake up I can remember everything so specifically like it really happened, then about a week later it really happens. Some nights I will have a dream and see what happened in my dream on the news the next morning. I am native American and I come from a family of psychic abilities. Do I have them? For example my grandpa a year ago died a week before he died I had dreams he was going to die. I knew it I could look at him and say his time was up. A week later he died and that night I had slept perfectly fine. Most of my family knew it was going to happen as well. Sometimes we even have the same dreams. I have been told even by a tarot reader that she could sense I had the knowledge to know. I didn't believe her. She told me that I was part of the immortal which really scared me. I can pick up on spirits but I know when there around I can feel it, it seems like they want to talk or have something to say I'm not paranoid and I have been told that I can have the ability see the future and talk to the other side. When someone is around my ears will pop & hurt its gets hard to breathe like something pushing down on my chest. And they say it's because I am a native I can see and feel these things it's just a part of my culture. It really confuses me could someone please explain this to me clearly. Mediums say they can feel my presence when I walk in a room. When we have powwows the elders always stare at me like I know something. I always feel like something is watching me as well or something is constantly with me I just can't figure it out. I'm scared and confused.