This topic is sooo me! I have done this since I was 13 years old, when I refused to listen to people and wore an outfit that looked hideous and I lied to myself saying that I looked great (when instead I knew I was just wearing my favourite items in my wardrobe and didn’t care if they matched) eeew makes me cringe thinking about it.
I also think it is a poor idea to lie to yourself when you tell yourself just one more slice of that cake wont hurt- indulge by all means but remember the line.
Another time in my life that comes to mind that was a really poor idea was when I stayed in a not so great relationship. It was a safety zone and lying to myself kept me there. So how do you know when you are lying to yourself, is when you hear your gut and subconscious voice telling you so and you ignore it.
So my advice is learn from your mistakes or try and don’t forget the lessons learnt whether from a bad outfit choice to that guy you thinking of staying in a relationship with. Life is too short to spend it in a ‘lie’ or lying to yourself.