Growing up

Does anyone have any answers to this? I’m 23. I’m recently married, and I’m sitting here watching my life go by so fast. I’m seeing my parents age, I’m watching my grandparents die, close friends pass away, and I’m so sad. It makes me want to go back to being a child and always having my mom and dad by my side. I love my husband but as an adult I never knew how hard it would be to watch life go by so quickly. I cry about it sometimes, like right now. I know God says to not worry about tomorrow, to always press forward but how can i press forward when diseases are happening around me? When my grandparents are dying and my parents are aging? I’m so conflicted. I know I need to trust God and let go but I can’t help but sit here And just sob about it sometimes.