Memories That Aren't Mine

Hey everyone, I'm new here on this site, but I guess that's a good thing that way I can tell my experience and have people that are spiritual enough to understand or help.

So, my story/experience kind of has 2 aspects to it. As said in the title, I have a very vague memory that I know is not a dream (I will get to that in a moment) and also, is not mine. Now the memory that I have goes as said:

I feel as if I am very young, probably around 5-8 years old and I'm looking around but only see mist, then my grandma (I don't know how I have this feeling that she is in fact my grandma, but I do) comes up to me and tells me that there has been a curse on our family that foretells bad luck and tragedy and that each son passed down through each generation is cursed. Or seen as a bad omen. I look around and feel nothing but sorrow, pure emptiness.

And that's where that memory ends. I know for a fact that the people in it are Native, and I also am Native in real life. I personally, am a very smart, intelligent spiritual man. I am 20 years old, soon to be 21, and unlike most people I see the world for what it really is. Saying that, I seem to have bad luck, ALOT. I'm not just over-exaggerating,but it seems whoever seems to get close to me, something unfortunate happens, and/or something bad happens that screws me over.It's been like this since early childhood for me.

Also,I know this is not a dream at all, because somewhere in the back of my mind I have that random instinct that tells me its a memory. The same way you look back at your high school memories, the same kind of feeling pops up when I think of that memory that isn't mine.Also, talking about dreams, mine seem to come true. Not all, (hopefully), but what will seem like a random dream of nothingness at the time, will come to pass in reality, whether it be months or weeks later. Pretty much, De Ja Vu. Is that all that is? Lets hope not all my dreams come true, or we're looking at a very grim future, haha.

Now, as I conclude, I have some theories that could connect to spirituality as well. I have often thought that it might be one of my ancestors reaching me through a forgotten dream, or though a vision of some sort, (talking about the memory that I know isn't mine).

I would really like some feedback in my experience (s),and some possible answers or some other theories might help, it's really been weighing on me lately, even kind of haunting me so to speak.