Is it better to be a nurse in a hospital or a high-speed train attendant? . . . . It's urgent.

I think since you have the opportunity to go to work on the high-speed rail, you also want to go. Why don't you seize the opportunity? When you feel that you regret your job or it is too boring, you can continue to go back to the junior college or undergraduate course when you want to change, and then go to the plastic surgery hospital. Basically, no one will do the same job all his life. It is ok to change your job and your life, as long as you want to live the life you want.