What does my end of the world dream mean?

i had a dream that i was going to the park with my old baseball team to play again. then next thing i know im at home and my mom is calling me saying"Megan come look at this" i walk out there and look up at the sky and see a Asteroid hitting earth. i remember seeing hearing the news in the dream saying most of the worlds population was gone, it was so real, because in the dream i was saying "im dreaming" over and over, but then id say no im not. i also kept repeating "i don't wanna die" over and over, but anyway why did i dream this, and this isn't the first time i have dreamed about a asteroid hitting the earth.