Welcome, this is a very common story line. I tried at 10, 17 ... 40 something, then at 57 I decided to make it work.
As Lisa points out, finding the reasons why it didn't work before will help. In my case, it was not understanding how much work was involved matched with unrealistic expectations.
Regular practice and patience have turned the page.
Best of luck.
This year the diet is definitely gonna stick!