Use rejection theory to overcome fear and doubt: Try getting one hundred NOs.
For example, next time you're at a cafe, ask for a free coffee.
Worst case, you'll pay for your coffee as usual and you've collected a 'No.' Best case, you get a free coffee.
Watch (15 min) TED Talk: What I learned from 100 days of rejection | Jia Jiang
Don't drink coffee
If I want something I pay for it myself, nothing is free