My indecisiveness is going out of hand

Due to my indecisiveness I have cost a big worry for my future. Idk what to do I'm scared I was affraid of choosing so I signed up for another one but when the results are out I felt bad that I got in to the one I signed up for as back up what to do? Am I feeling this because me and my friends won't be together and can't help me in class anymore or am I sad because I felt like the other one has better opportunities than the other or am I afraid I can't survive it alone what to do I can't change it anymore I need to take responsibility for my stupidity