Man remember everybody has their own insecurities but some people are good at hiding these insecurities and that's actually what you need to do unless you talk about it mostly people wouldn't even guess ur insecurities so try to keep those thoughts to yourself and work hard to change things you hate about yourself and try to be the better version of yourself and confidence is key and fake it till you make it plus no one knows if you're faking your confidence or not- and yeah man forget about the world and try to feel good about the things you have and try to be happy:)