Do you have any idea how valuable you are? If you suffer from self-doubt or self-hatred, if you abuse your body with bad food or bad habits, even if you simply put yourself at the very bottom of the lost of people you do things for, under the kids and spouse and parents and boss and friends, then you don't understand your own value. If you did, you wouldn't treat yourself that way.
You were put on this earth to spread God's love, and nothing could be more valuable that that. Maybe you never learned your importance. It took me many years of studying God's word and fellowshipping with Him before I got even an inkling of my own worth.
God has a great future planned for you and you need to be ready for it! You need to be looking great and feeling great, ready to do whatever God asks you to do.