Hi JJP.
I'm glad you thought of the Law of Attraction. That reminds you how you highly influence the nature of your thoughts and invite opportunities, people and experiences into your life. You are in charge. You have that power and you may underestimate the impact that this has on your life.
I like the suggestions made in the previous post. The idea of talking out your ideas and feelings can be very useful. You could approach a guidance counsellor, minister, friends, people you know or don't know. Sometimes groups of students also get together to work through student issues rather anonymously. The key thing is to express yourself. The idea mentioned about visiting a library is something I'd also suggest. Not only is this a quiet place to get focused for study, you can also consult books about people who may have experienced similar fears and confusion as you. Find out how they dealt with this. Expand your understanding of yoruself and your choices.
If you prefer, write in a journal. Express all your feelings and what specific life experiences you think seem to trigger them. List the positive and negative feelings. Don't leave any out. Who are the people that you think about when you experience these feelings? Are you making choices for these people or for yourself? Sit back and read what you wrote. Do you grasp your thoughts and feelings and act in ways that your heart, mind and intuition guide you? Only you can figure out the kinds of decisions will make you feel good about yourself. Changing your goals as you evolve is natural. No need to rush though. It can be a good habit to finish things you start.