Your description is exactly how i used to think when i was 16. Decades later, I still stutter, but not as much, but i have stable job, stable relationship and stable life. All I say atm is go out of your comfort zone and face everything that comes towards your way, not shy away. Then, reflect on both - what goes well and not very well. Log them all if you can. Eventually, you will start learning about yourself, get desensitized and get more confident. In the interview, let them know in advance that you are a stutterer and ask them to bear with you when needed. I have learnt that being open in advance suddenly improves the confidence.