define opportunity cost

all the needs & wants will never get fulfill
& there is no satisfaction ~
I wonder what is my opportunity cost here
really very confused & no idea
which one is my priority

- manicure course
- professional accounting course
- working environment
- my future career
- travel
- getting a new car
- alots more ~

yeah, once i choose one of it and i got to forgo the rest of it ~

*she had been wondering all the while that when only she able to accomplish all her wish*