How to Tell Your Ex How You Feel

I feel like she's better than me in every way younger thinner cool or more fun talented confident and all the time in my rational mind I know this stuff is not important. I'm terrified of being in a social situation with her so much that I've not gone on nights out or spent money for new outfits just in case I see her. I make up scenarios about them which I have no idea if they're true or not imagining this amazing relationship where everything was perfect. I've blocked her on social media I've had big talks with myself about reclaiming my own individuality but then at a low point I will go back to this horrible place please help talk some sense into me  �