Retrogression?

A sad realization I've reached:

My self esteem has reached an all time low. I don't even think I felt this bad about myself in middle school. Everyone hates themselves in middle school. I've always been a little self-deprecating. But I don't think it was ever a problem.

It suddenly is. And more than anything I want to fix it. I don't want to be the immature 22 year old who can't be happy with herself. I don't want to be like so many girls I've seen and known who couldn't care enough about themselves to respect themselves.

I feel like, give me a person, any person, a stranger I don't know, even someone I know (or knew) and hate or dislike. And I can tell you redeeming qualities about them, good qualities about them. I can give them the benefit of the doubt and the leisure of being themselves.

But I can't do that for myself.

This isn't some pathetic attempt to attain compliments. I'm not fishing for them. I could be told a million times that I'm not fat, I'm not stupid, I'm not horribly ugly, I'm not boring, or loserly, or a million other things. And it doesn't sink it. I don't need to be told things,

I need to some how change my very psychological make-up to believe in them. More importantly, to believe in myself without anyone needing to tell me anything.

But I don't know how. I see the problem. I don't know what the solution is.How do you change the way you think about something after 22 years of developing that opinion?

Is this something I shouldn't worry about because I'll outgrow it? Is this something I shouldn't ignore because it's a detrimental problem?

I can honestly say that every day I have a moment of feeling bad about myself. Maybe it's social anxiety, maybe it's mild depression, maybe it's an after effect of heart break, or pain, or society and culture, or my upbringing. I honestly don't know. And I honestly think it's possible it's all of that.

But what do I do?