Self-acceptance.
I struggled with this as a teenager. Social media did not make it easier. I would spend hours scrolling through my newsfeed and comparing myself with people who I considered my age mates.
It only got me depressed, increased my self-doubt and made it wise for me to develop myself.
What I later discovered was that my mates were indeed better than me. And what placed them at those "high" positions were the conscious efforts they made towards their development.
If I wanted what they had, I have to practice same habit. I even mingled with them just to learn by association. In other cases, I'd compliment their successes and ask what worked for them.
Soon, they began introducing me to the groups they join to access valuable information, the courses they take and people they follow.
I agree that self-acceptance comes when you have a growth mindset, when you believe you will improve and work towards achieving this rather than wallowing in senseless self pity.
Big congratulations to you on your journey to self-acceptance.