Soklu, you are awesome. No matter what you look like.
OK now... Being confident is in your mind. You see overweight people everywhere and some of them are the most confident people you'll find. Why is that? They don't have perfect bodies. That says they don't need perfect bodies to be confident. They know what they're capable of in their mind. They know what they have...
There are many different aspects to self confidence. Not only physical but stuff like the relationship you may be in, your family and how they treat you, how well you're doing at work and if you're financially stable, how smart you are... etc... All these thing together can make up a person's confidence IN ADDITION TO how fat one is. If you have all the rest, but are overweight, you might be better off than other "fat" women who don't have it. Confidence is a lifestyle. Look at a confident person and you're not only looking at a "nice" body, but a LIFE that is filled with good or "happy" or whatever stuff. Surround yourself with the above things AND get into better shape and you'll never go back to being unconfident.