i managed to stop eating junk food but diets are just not for me, are there any exercise programs to do at home?
Well, you don't have to "go on a diet", but you definately need to control your diet, that is that you need to figure out how many calories your body needs to subsist on every day, and you need to eat less than that, essentially.
Most if not all diet programs that you go on are either unnecessarily restrictive, or 1 size fits all plans that are based on counting calories, but not taylored specifically to your needs. To form your own diet plan (which is just a fancy way of saying "what you eat every day"), you can lose weight at a healthy rate without being restrictive on your diet. You'll probably have to make some tough decisions - cutting out junk food was a good start, but don't think that you can never have another dorito, slice of pizza, or chicken wing ever again. Thats being unnecessarily restirictive and will make it difficult to stick to. As long as you're keeping track of calories, your diet can, to an extent, be made up of just about anything you want. However, you will feel more satisfied by eating stuff like vegetables and chicken because you will literally feel like you have to gorge yourself to get a good amount of calories.
As for excercise, there are lots of options. Check out the exercise section of the forum for some stickies on exercises you can do at home. There are also workout DVD's you can try if you're into that kinda thing. There's a home program called P90X that seems to be pretty popular lately, although I don't know from first hand experience. You can do bodyweight exercises - pushups and bodyweight squats and pull ups. If you have stairs, run up and down them for 20 minutes, or do 1 minute on, 1 off for intervals. "Not having time" is one excuse I will never accept. Anybody can take a half hour before bed and do a quick workout. Anybody can wake up an hour or 2 early in the mornings to go for a run or to the gym. For a while, I worked out during my lunch break at work, either oing out for a run, or going to the work gym. Fortunately my job provides the adequate fitness center and locker rooms with showers. "Not having time" is just a bad excuse to convince yourself that its just not possible to do something, so that when you don't do it, its not your fault.
Most importantly, you really have to want to lose weight for the right reasons. You have to want to be healthy, and you have to realize that living healthy is going to seem like a job, especially at first, and you have to realize that its something you will probably have to work at for the rest of your life. As soon as you realize that, and really decide thats what you want - well thats more than half the battle right there.