Q: how do you deal with the: oh, this chord feels nice. oh, this one feels better. oh, this one is actually better than the two before. oh, this one is kinda in between, etc. whenever I'm making a song I can't help but think whether the chords I used were the best. Have you ever felt like this?
A: yes, absolutely. i will nitpick every little thing, often even how loud to play each note of the chord. there's basically 2 solutions: worry about it forever, or stop worrying about it Now. after you stop worrying about it and put out a couple (or a hundred)  "really sloppy songs," you will eventually realize you are bulletproof enough to venture to worry about the chords "just the right amount." but you will never get there unless you lower your standards enough to get the machine moving. also, plot twist, if you really are as sensitive as you say you are, even your sloppiest version is actually going to be pretty great.