How do I stop being a narcissist? I have a kind and pretty gf who cares about me a lot but I constantly have to fight thoughts like "I'm better than her and can get better" but I'll just think the same thing with the next "better" girl and it's like I'm permentantly procrastinating my life because I think no situation is good enough for me to commit to

Do I just have to suffer enough to desire committing over continuing to be a narcissist or is there a less painful way?