Decisions, and sticking to them

I’ve been trying very hard to make and reason out a bunch of decisions. It isn’t easy when you don’t really know
a. what it is you’re aiming for.
b. whether the course of action you decree to be the solution really results in forwarding the aim you’re unsure about.

I’ve really tried, but it’s so hard to just go out and execute plans. Things are awesome at the moment. Are fears considering future eventualities, distance, changes and so on warranted? And what’s up with me working under the assumption emotions are simple things that can be turned on or off at a moment’s notice?