Try not to be too hard on yourself, yes your here but you can work on it and get healthier!
4 years ago I lots 13kg, Im not sure if thats what you would class as a big weight loss? I joined the gym and cut saturated fats out of my diet(by going vego) it was the best decision I ever made.
Going to the gym(or excersizing at home whatever) regularly is a great way to get fit and start feeling better about yourself. Even running with pram, good excuse to get out of the house... Good luck, you can do it!