I hate the end results of my braces. What should I do? Can I change my orthodontist?

You have options but without more specific details or pictures of what it is you are not happy about it is difficult to make any specific recommendations. Most of the time, people who are unhappy with orthodontic results are not unhappy about the straightness of their teeth but rather the narrowness of their smile or the negative changes that are manifested in their face, profile or smile. If you are unhappy with the results of braces it is unlikely that just putting braces back on would resolve your concerns. You still have options; but again, it's impossible to offer specific recommendations without knowing the specific concerns.Good luck!