i am ready for things to move forward in my life. i feel like things are stagnant.i need change

I feel so trapped in my marriage. We have been together since high school and I just feel like he will never grow up. I'm mentally exhausted. But terrified to end my marriage because I have been a stay at home mom for 10 years and have no idea how I would support us.

if i left...would anyone even notice. i feel like i am a burden to my home and to my family. i feel that i cause more stress than anything else. why do i get caught up in these feelings. it sucks.