A lot hinges on how much you want to lose and how you're "trying." The more you weigh, the quicker you lose at the start. As you lose, the loss rate slows down. When you approach your ideal weight you lose very slowly.
It's important to understand what you're ideal weight is. If you are at or below your ideal weight now and still want to lose, that could be the beginning of an eating disorder.
The US Dept. of Agriculture did an extensive study a few years ago of all of the magic weight loss products on the market and concluded that none of them work. Some of the diet plans help but they're just ways to make the process simpler, it's still all mathematics: If you burn more calories than you eat, you lose. If you eat more than you burn, you gain. That means you have to eat less and/or burn more.
What you eat makes a lot of difference. It's hard to eat enough vegetables to gain but a small amount of fast-food and sugar based soft drinks will do it. There's a lot of psychology to it also. If you constantly weigh yourself, it's easy to get discouraged. The more food is on your mind the less chance of success.
My suggestion would be to try to change your daily habits and forget about the scales. Change to eating as many vegtables as you can and reduce the portions of the rest to an absolute minimum. Use meat as a flavor for the veggies only. Get involved in every activity possible and stay busy every hour you're awake. If you sit there staring at the refrigerator door, the "fridge" is always going to win the battle.
Don't make it a "diet," make it a lifestyle change. That means it's permanent, not temporary. Bottom line: If you eat the number of calories for your target weight long enough, your weight will eventually adjust to that level. If you eat 3500 calories more than you burn, you gain one pound. If you burn 3600 more than you consume you lose one pound. The math is simple, it's changing your routine that's the challenge.