Feeling indecisive, second guessing yourself, or having trouble with a decision can mean:
You're feeling stressed about decision making in real life, or just stressed in general
You're feeling mentally overloaded, perhaps by too many decisions, items on your to-do list, or things to think about
You're feeling you're not thinking clearly right now
You're putting extra pressure on yourself somehow in your life right now
You tend to get stressed about making decisions in general