What I think is important to remember is that self esteem and happiness all throughout our lives will not magically appear once we fit into a size 5, or weigh 125 pounds. (or whatever our goal weight or size happens to be.) If you are not happy and self confident at 140, then you aren't going to be happy all of a sudden when you hit 130. It just isn't the way it works.
Self esteem and happiness comes from within.
BUT-this does not mean that you should sabotoge yourself, or forget your eating/exercise regime because you aren't going to all of a sudden be self confident, or have a dream life at your goal weight. Your goal weight is a big achievment, and it is something to really be proud of, but it doesn't change everything in your life.
Being healthier and more fit DOES do a lot of things though-so when you feel the sabotoge monster telling you "What's the point?" think about your health, your well being, and your fitness. Think about extending your life, and being more energetic for your family and friends.
I think it is important for self esteem and self worth to have something in your life that is "yours". If you have an interest, a hobby, or something that you are good at or enjoy, then DO it. Take time and do something regularly just for yourself. When you love yourself enough to take that painting class that you always wanted to, take those line dancing lessons, read that novel that you had been wanting to, or attending that adult French class in your area you are doing something that is for YOU. Everyone has an interest, or a talent, or something that they want/like to do.
When I married and had my children, I went from taking care of myself to taking care of them, and for a few years I forgot about ME. It really did a number on my self esteem. I had nothing for me-I lived my life for everyone else. When my youngest was around 8 months old, I said "enough!" I started taking dance lessons once a week, I started taking a long scented bubble bath once or twice a week when the kids went to bed instead of a quick shower-and I started exercising regularly when my baby napped. I started taking the time to do things for myself, and I started feeling better about myself because of it.
You are doing the right thing by doing what you can to get healthy and more fit, but it isn't instant happiness when you reach goal. As far as the actual weight goals, loss is the easier part of it all-keeping it off for life is the hardest part.
My advice is to live your life and create your own happiness by being true to yourself, and doing things for yourself, and not expecting happiness to come from reaching a weight or certain size.
Good luck,
Aphil