What does my dream mean?

Yesterday I had a dream that I was in my dining room and from my window i was looking in the backyard and my backyard is next to a park . I saw this really scary guy come from the park into my backyard so i went to my kitchen and told my aunt so from the kitchen window she told my uncle there was a guy behind him because the scary guy went to the side of my house after my backyard and then I ran outside and my uncle cousin and the scary guy were in front of my garage and my uncle pulled out a pocket knife but the guy had a gun and began firing and shot my cousin and then my uncle he missed me so i ran to my grandmas room in the house and locked my door. thats where my dream ended. Honestly in my previous dreams before yesterday i had dreams where groups of guys came into my house from the park into my backyard and then into my house and were killing my family too...can someone please tell me what my dream means i get scared to sleep easily sometimes.