Accurate
Entertain the idea that you may not be the funniest, or coolest, or best looking.
If you question, then you can test and see if you are indeed better than basic.
Once you have the confidence that you are in fact funny, and cool, and good looking. You can aim higher and more accurately.
Furthermore, you can set boundaries, because you are confident in your value.
You can flex your best attributes.
Insecurity comes from the thinking you haven’t earned or don’t deserve what you have. So make sure you deserve it and have earned it.