Can i have an elective breast surgery at 17 years old without my parent's permission?

No: Not in california unless you are an emancipated minor. I believe the other states are similar.

No.: Current federal guidelines say no cosmetic breast augmentation until age 18. Further, you need your parents permission to consent to surgery, unless you are an emancipated minor.

No: No, you will need parenteral consent until the age of 18. Regardless, always best to have as much familial support/help as possible around the time of surgery. Best wishes.

No: Age of consent is 18 unless you are an emancipated minor.