There are many theories and many experts out there who think they may have the answer to weight loss, eating well, and daily exercise (just to name a few) but nothing earth shattering or shocking has come out of these studies, products and promises for life long change.
If you want to make a change and feel ready to move, it is important to be honest and open with yourself. You are not a "bad" person because you eat junk food. You are not a "bad" person because you don't enjoy exercise. I am very sorry if you get that vibe from the fitness leaders and health professionals in your community because it simply isn't true. There is no such thing as "good" or "bad" and those that believe there is judging based upon their own hangups (there, that's my judgement).
No one is perfect. Everyone struggles with something. In my opinion, it is through honesty that you will find life long success. True, you may fall back into old habits but just get up again and start over. Keep at it. On average, "the research" says that it takes about 9 tries before change is successful. Celebrate that your lapses when you have them...it just means you are closer to success!