Nearing 30 years old. Seeing high achievers in their 20s shocks me

Whenever I see someone who has their shit together, like being independent, college educated with a good job, who has plenty of disposable income, social and romantic success and they reveal that they're still in their 20s it often gives me a jolt and stops me in my tracks. It's one of the few scenarios where I can't help but reflect on my age and how embarrassing my situation is in comparison. These hyper competent people to me seem amazing and completely alien at the same time, I just can't comprehend how they can be as they are. How is it possible that they lived *less* than me but accomplished all of that? I'm beginning to accept that I'm just "different" and that my mind is defectuous (diagnosed mental illness), but it still hurts when it happens. Anyone relate?