I am 20 and thinking of having a breast augmentation secretly.

I am currently at university abroad so my family won’t notice where I am etc. I am so insecure about my breasts because they are so small and empty. I have been thinking about it since 16 that If my breasts wouldn’t grow at a desired size I would want to go under the knife. I just don’t know if it is a good idea for nobody to know. I am so scared. I want them to believe that they have developed now. And anyway I wont grow them that much that it will seem fake. I have been saving money and I think I have more than enough. Are there any possible side effects that may be dangerous? Should I at least have a friend to know? I really want it to be my personal secret...