Like losing weight, changing mental habits isn't something you can do overnight. However, you can make progress by critically unpacking and examining your emotions, and doing things that help foster that sense of pride and value. I am not a therapist of any kind (and there is no real substitute for one). However, do some research on cognitive behavioral therapy, and the techniques cbt uses to help people examine and change their negative emotions and skewed perceptions. Even if you can't afford a professional to help you through the process, you may find some benefit from the kind of self-examination it entails. For example, the end of [this article](http://www.theatlantic.com/magazine/archive/2015/09/the-coddling-of-the-american-mind/399356/#Cognitive%20Disorders) contains a list of common cognitive distortions. Do any sound familiar?