It's odd that you are aware, yet not aware.
You use the words 'I don't see'. Meaning, you are consciously aware of the fact you are disregarding positivity. But your words after practically disregard this set of words after that.
The other is using the words 'The ones that'. As if another enitity/entities are influencing your thoughts. It's clearly the not the people around you, from what I've seen. And if people in your life are saying it. You seem to want to take it as gospel when mistakes, or things out of your control, happen.
Self-doubt and self-loathing feed off the negativity you hold in yourself, and tell yourself, out of discouragement. It's part of the misery cycle you are trapped in.
I mean this in a sympathetic way and not a condescending way. You are not ready, yet. As in, you haven't accepted that life happens and that you are allowed to be an individual. However, this doesn't mean you should stop trying.
Take a closer look at yourself in moments of self-doubt.
-What do your hear in yourself?
-Is it irrational?
-Do you notice you repeat certain kinds of buzz words?
Only you can help yourself here. But you have to be willing to.