Hi and welcome! You are being so hard on yourself! If you had a friend who spent all their time putting you down and calling you names, saying how useless you were, would you keep them as a friend? Probably not, you'd tell them where to go! So why do this to yourself?
You're certainly not hideously overweight and so you've got a bit of a belly - well women do have a belly particularly after after having children! Trust me there will be many people around here who have way more to lose than you and would love to be in your body.
That said, you want to lose a bit of weight - well then you've made a great first step by joining SW and coming on here. The SW plan is fantastic and you'll get so much support here from people who know exactly what you're going through. And I think you need to speak to your parents and husband to get their support in this, rather than feeling that they are disappointed in you, which I'm sure isn't the case.
Take care
