You know, recognizing that you need to make a change to make your life better is one thing...and totally a powerful motivator! But I've never met ANYONE who got more motivated based on self-loathing or self-deprecation.
I, personally, think that the commitment to lose weight and the perseverence to stick to that commitment come from believing that you, AS YOU ARE TODAY, are worth the effort to make yourself the best you that you can be. And hating where you are today isn't going to get you any closer to that goal.
So time for some thinking...what do you LIKE about yourself? What are your unique, wonderful qualities that make you, you? If you can't list any, it may be time to get some professional help to improve your self-image. All of us have worth, whether we see it or not, so if you're not seeing it, you may need some expert help in finding it for yourself.
Regardless of your weight, you are a worthy person...SO worthy, in fact, that you're definitely worth the effort to get healthier and stronger.