I'll be the last to say that weight management is easy - I've fought the battle my whole life - but if you eat less calories than your body burns, you will lose weight. The hard part is doing it consistently over the long run. Things I would ask, are (I'm not necessarily asking you to answer, just think about the answers):

* Are you actually tracking your calories with something like MyFitnessPal? What's your calorie intake?

* Are you tracking honestly? Especially if/when you have a bad day, or cheat day, or whatever you want to call it.

* Are you tracking accurately? If you aren't using a scale or measuring cup, the answer is probably no. Most people severely underestimate the size of their portions.