We're not all equal as far as intelligence is concerned. We're not equal as far as size. We're not all equal as far as appearance. We do not all have the same opportunities. We're not born in the same environments, but we're all absolutely equal in having the opportunity to make the most of what we have and not comparing or worrying about what others have.
You can always look back and see where you might have done something differently, changed this or that. If you can learn something, fine, but never second-guess yourself. It's wasted effort.... Does worrying about it, complaining about it, change it? Nope, it just wastes your time. And if you complain about it to other people, you're also wasting their time. Nothing is gained by wasting all of that time.