This will likely turn out to be long. The TL;DR version/question: How do you cope with self-doubt as a musician? How do you not lose motivation listening to players who are (or you perceive them to be) "better" (and how do we define that?) than you?
Self-doubt is something most of us have to grapple with, professionals or not, musicians or not, artists or not. To an extent it's human nature - to another extent a product of our contemporary societies, but that's another discussion.
Focusing on music playing and making, which is our scope, I feel surprisingly affected by self-doubt. I say surprisingly because I'm strictly an amateur, playing and composing for my own pleasure. I have no professional skin in the game, my lack of abilities does not affect my livelihood in any way. It's also surprising because I consider myself a very average player (as in, I'm fully aware of my many limitations). You'd think self-doubt would affect one who's more advanced than I am, advanced enough to know they are advanced (which, ironically enough, would leave them vulnerable to self-doubt).
To me, self-doubt comes in the form of what I call "why do I even bother?" Seeing "real" bass musicians play inspires very conflicting feelings. I'm both in awe of their skills and love to listen to them, and it fills me with dread because I know I'll never play as well.
Skill improvement is a complex thing, to be sure: It depends on natural talent (the way our brains our wired), motivation, working on improving, possible physical limitations, and all that. For someone like me, the main cause for my lack of skills is simply that, as I said, I have no professional skin in the game. I love playing, but I simply don't need to practice the way a professional (or aspiring professional) would.
On the other hand, we also need to address the elephant in the room: Is technical ability the only thing that matters? I'd argue that it isn't. I don't have the speed Robert Trujillo has, but hey, neither does (I assume?) Leland Sklar. But music is so much more than speed or technicality; it's about affect. I've composed some songs - all by myself, programming drums, playing bass and guitars - that, when I listen to now, I'm a bit surprised with how good they turned out. They're not technically great, but the emotional impact is there.
So, how does an amateur deal with self-doubt?
A friend of mine - who is a physicist; maybe that informs his way of thinking - says there's no meaning in self-doubt: Either you work for it and improve, or you don't so stop whining. But humans are complex beings, and artists even more so; it doesn't work that way.
To repeat the questions in the first paragraph: As a bass player, a musician, an artist, how do you cope with self-doubt? How do you not lose motivation listening to players whom you perceive as "better" than you?
I don't go out of my way to listen to other bassists. I, like you have very little professional skin in the game. I spend most of my free time learning covers, and listening to someone's style just comes with that. I've come to admire certain people just because I needed to learn the song.
I always thought that technical ability, speed, etc really doesn't have much to do with being a great musician. The reason I say that is watching or listening to someone who plays a million notes a minute without really saying anything kinda makes me sick. It's a turnoff.
There are a few musicians that could speak with their instruments better than most people people speak their native language. I admire that.
But I just totally miss the point of watching someone who's technically better than me and feeling sub par. If someone plays far out crazy lines that I admire then they hopefully become an influence on my playing. I don't have to be as fast or articulate as they are to incorporate the magic they have into my playing.
So honestly I don't experience much self doubt, but what little I have is dealt with for the sheer love of playing, seeing what comes out of it.
I understand I could be coming off as ignorant, I'm not. I think it's awesome that there are others to learn from and I respect the time and effort they've put in. It gives me a way to better myself. They've put more time and effort, or just have more natural ability, I respect that a lot too.
Even if it comes off as ignorant it still doesn't matter. I'm happy with my playing. Sometimes I find the time to better myself and it makes me even happier.