I’m so anxious thinking about my future that I feel physically sick

I’m 19 (20 in June) and I’m a theatre major (with a mass comm minor) and I have no clue what I’m doing when I graduate. I feel behind because I originally wanted to pursue acting but I’ve realized how much I love playwriting. But I haven’t even written a full length play yet. Everyone around me seems like they have everything figured out and they’re so accomplished. I need to know what I’m doing after graduation but how can I plan for my future when I can’t even think about without being in the verge of vomiting.