How Can I Have Goals in Life without Getting Attached?

Q: My question is about non-attachment and goals in life. I have noticed that having goals in relationship or career can bring a lot of stress. For example, when I was applying to do my exchange in Korea, I was worried something might go wrong with my application and I have a lot of stress. And I learned that not being attached to things could bring happiness and less stress but I still think I still have to have some goals that I want to achieve in my life. So how would it be possible to combine these two things in my everyday life?