of course! everyone does sometimes, I mean heck sometimes I look at other peoples work and feel so useless because mine is far lower quality, or I feel like the idea I thought was unique obviously comes from somewhere else, or someone has got there first, or the jokes I write are hackneyed and cheesy, but you know? it passes, everything passes, and you have to know that you’ve seen the art before you’ve made it inside your head, so of course it feels less exciting to you when you see it done- to someone else, it’s brand new! like, dang, there’s a thing that didn’t exist before! neat! you have to get that excitement into your head, or rather, remember it- you’re creating something that is one hundred percent you and yours! that’s awesome!
if you’re right up close to an object or have been looking at it for a long time of course you don’t see it at its best; in that way an artist always has the worst perspective to see their art from, and it sucks! but it is that way for everyone, and if you learn to step back, take a breath, and consider how far you’ve come from where you started you will get a much, much better view of your work
then you have to pick up the pencil and start it all over again