If you can’t decide, the answer is no

Not sure if she’s the one? If you like her? Then she’s not, and you don’t.

Not sure if you want to apply for this job or that school? Then you don’t.

Not sure if you should do X? Then don’t do X.

It’s the hardest thing, resisting the temptation to do something, when nature just wants to take its course. Calamities are wrought every day by humans doing too much.