I Am Insecure

How do people get over their insecurities? Mines rule over me and pretty much ruin everything in my life. Relationships, sleep, projects etc...

It's a constant barrage of what I'm lacking and how it's all gonna fall apart because of it. How do people do it?

It's not enough to want to change apparently cause that's defo not working for me. Booze can't be the only calm I get. There has to bee a better way.