I worry that something unforeseen and external could pop up and disrupt my current situation When the situation changes, I'll live as the situation has changed

I worry that something unforeseen and external could pop up and disrupt my current situation When the situation changes, I'll live as the situation has changed. I know one day it will happen, that is why now is the time to live life as it is now, or later I'll regret why I didn't take the time to enjoy what I have now.