Doubt
Don't you ever just stop and think to yourself, what if you had done things differently, chosen another option, what would it have been like?
Don't you ever just stop and reconsider every choice you've made so far in your life?
Wondering constantly if this is the "right" path for you, wanting to breakdown and cry but no tears fall, because you've cried about it too many times. The stress can't help but build up on your shoulders, especially if you bottle it up, screw the lid on your emotions so tight until it's destined to burst and overflow one day. Even if you're someone who rants and vents to friends or family, the stress will still find a way to you, eating away at you until you become an explosive "monster" or a numb shell of who you were before.
When every decision you make feels like it'll cost the stars in the galaxy, every decision is so hard to make because the sinking feeling in your gut is almost too much to bear...because you've made mistakes before and you're scared to make more.
So now you're just stuck in the same position, the same moment in life, frozen in time, unable to move forwards because you're unable to make new decisions.