I hope this doesn’t come off as unsolicited advice, I can relate to what you said and want to share my two cents if you care to receive it. During my late teens and through my whole twenties I felt that same way. It passed over time. I’m still awful concerned for the future, but not outwardly, and not anxiously. If what you’re experiencing is like that, where it affects your ability to cope with reality, or affects your motor functions, I empathize with you on that and can honestly say it gets better with time and practice. If your journey takes you to a new country, let me just say good luck and may the universe or gods or whatever you believe in bless you with safe travels.