I am a perfectionist / narcissist

I am a self-proclaimed perfectionist. I am extremely critical of myself and those around me. I believe it to be a result of low self-esteem and insecurity. I have narcissistic tendencies as well which I believe to be a result of the same thing. I know I behave in a way that can be seen as "unlikable" at times because of this. I'm simply looking for advice to stop overthinking and act with confidence!