You overcome a lot of fear already, probably because you lived in and experienced being in those environments that ussed to make you anxious, but working in a real job is not one of these experiences. You are in your 20s, you have to get as much experience as you could before turning 30. You may or will fail, but that is a proxy for trying and then getting prepared for what is next, if you don't try and overcome this fear you will be stock in this stage of your life and gonna regret it.