It helps to find a plan that works for you and that you can stick with long term. I like calorie counting and others like WW, Atkins, etc.
It also helps to find a form of exercise that you enjoy (at least a little). I like to run and ride my bike.
Or you can just start small and not start with an eating plan. Add in more fruit and veggies. Add in more exercise (even just walking!) and then once you feel comfortable with that move on to cutting out foods - like candy and pop and other unhealthy things. Sometimes, it's hard to cut everything out at once and make drastic changes - it's harder to stick with.
You can do this. I never thought it would be possible for me to do it, but I have. I've kept off most of the weight I've lost and am working on losing the rest. You can do it.