That's not your age, that's insecurity.
And your age is the excuse to compare yourself to others.
And if you were the same age as those guys, then it would their art skills.
And if you had the same art skills, then it would be because they have posted more, etc.
Don't put the blame on others or on stuff you have no control over, so you can feel sorry for yourself.
Are you exhausted and need rest?
Are you surrounded by a toxic environment?
Do you feel you need some discipline?
Or to learn more art skills?
Or to make a habit out of dedicate an afternoon in the week to draw a page of your comic?
Whatever it is, do something about it. Research on whatever you need to do 