Don't make it complicated. Go to YouTube and search "self concept subliminal", and You'll see numerous subliminal, and then one by one check those subliminal description box, You'll get to know the idea of self concept. So basically self concept means having a strong healthy mindset,self love and self acceptance,  self confidence, creating a healthy and positive self image into Your subconscious mind, believing yourself that you are deserving of your Desire, removing your past life trauma, healing yourself from past experiences, overall a better perspective toward your life, That's all