Fear of making decisions- Any advice?

I am 22, and I have a fear of change. You only have one life to live and I am afraid I will choose the wrong path for myself and waste time :( . I realize I am wasting time by not choosing a path, but I don't want to just settle! I am also afraid of moving away from my twin sister because she only has one life to live too, and I feel guilty if I don't see her every single day! Everyday I can just feel the clock ticking and it makes me so anxious! What advice can you give me to help me be able to make life changing decisions so that I will not be stuck in limbo (this point in my life) forever?!