I know how you feel because I've felt it also. I am six months post op this month and before I was approved by my insurance I had to be enrolled in a weight lose program for a year, be psychologically evaluated and be tested for numerous health issues. I decided to stick with the process because I knew everything was being done for a reason and also I tried doing it on my own for years and I failed miserably. I don't and haven't regretted my decision at all.
There are many that have succeeded on their own, and I hope you will be one of them. Only you know what decision is best for you. Good luck!