Nightmare/trauma?

Ever since I was little, about 7 ive had frequent nightmares, Recently I had to watch my great great grandmother pass in hospice care and it was pretty traumatizing, I have had recurring nightmares about it and decided to look back at some pages in my old diaries i had written on my nightmares when i was younger...Problem is, I am realizing some of these "Nightmares" might have been real things that had happened to me, for example, I would have a nightmare about some guy my evil grandmother had been dating being unclothed? thing is, I don't remember who the guy is, also i was again, like 7 years old but it was a nightmare i had when i was little, I have had a few nightmares where I can't tell if its a nightmare or something that actually happened to me, I also have blurry spots in some of my memories, I am a teenager and yet to talk to my parents about it but I did go through a bit of trauma as a small child, Just confused and felt like i needed to say this somewhere.