it sounds like you have some anxiety circling around all that is going on tomorrow. breathe. make sure you get a restful night sleep and eat a healthy breakfast in the morning. it will be ok.

as for knowing whether it is the career for you, you will just have to see for yourself. Exposing yourself to new experiences is the only way to learn what you like and what you work well at. Give it a try. If it turns out that you don't enjoy it, you can try something new. I don't think that there is any presure to stick with anything right now.

Best of luck tomorrow! tell us how it went! I'll be thinking of u