Not only do they get it from different sources, but how they get it from those sources can be wildly different. There seem to be multiple definitions of self-esteem, self-confidence, and self-worth floating around online, so I won't address them specifically. I'd say they all generally deal with finding meaning in one's self & the world. And finding meaning is a deeply personal thing.

For example, I discover new meaning in my experiences by projecting their content/context into songs I'm listening to.

My take on tricking myself into something: if learning to love myself requires some level of confidence, temporarily inducing said confidence, can be helpful when combined with a practice for learning how to love myself. The trick is doing it with intention and then weaning off the confidence booster.

I already do this in various ways therapeutically. I was thinking about the second conscious voice in my head I accidentally created through my experiments & wondering if it's truly a second personality or if I'm simply playing pretend & naively fooling myself. Then I realized it doesn't matter because it's something helping me & as long as it's done in a transparent, authentic manner, nobody else has to care which it is, either.