How do I stop projecting my problems on to others?

As a child I was emotionally neglected and now if I see someone even sort of neglecting their child in some way I lash out, become angry and can't think rationally. I just automatically assume the worst of them and believe they are also emotionally neglecting them, even if they aren't.

Again I can't get myself to think rationally in the moment, what can I do to stop projecting my problems on to other people?

I am not longer in therapy or on medication (haven't been for a year) because my insurance no longer covers mental health so getting psychological help is not an option. I am still trying to find a psychiatrist but no luck finding one that is affordable yet.