It's funny isn't it, how often we compare ourselves to others when we are looking up and forward. Which is something I think you might be doing, looking forward instead of constantly looking back.
To preface I don't know you enough to make any assumption or tell you what to do, but this could be something you can fall back to that's in the back of your head whenever you feel this way!
Enjoy the little things! I doubt telling you not to feel this way or keep telling yourself you're awesome would work because they never worked on me, so just enjoy the little moments in life that makes you -- if not smile -- smirk a bit. You saw something that reminds you of a fond memory, you did something new that is small yet unique to you? celebrate those moments because those moments are what makes you inherently you.
Someone here also said familiarity of yourself can be a way making you feel lame, but isn't that also such a gift because you are so in tune with yourself? You know what you're doing even if you think they are nothing comparing to others.
And ultimately, maybe this could be a starting point for you to create/try/ experiment things too! If you think of yourself so far back already, what's to loose for you to break the status quo? right? Be the dryer sheet that could cause fire and burn down the entire house or something hehe. And if it goes to shit we just won't tell anybody about it. HA!
To quote what I've seen somewhere during my lowest low during the pandemic-
"There is no one like you, there has never been anyone like you, and there will never be anyone like you. Therefore, be yourself" beep boop bop beep boop