Your body is just an innate object. Don't believe me? Just look at any corpse. What differentiates a living body from a dead one is energy. Dead things do not have any energy so they cannot function. They cannot laugh, cry, have sex, go to work or do any of the other things we take for granted every day. Your body is the container that keeps all your 'working machinery' together.
Everyone's body is different. We have different colored skin, hair and eye color. Some of us are fat, some skinny. Some get fatter looking at a cake while some skinny people could eat the cake all in one sitting and not put on one pound. What makes us different? Our genes influence a lot of these factors. Our home life and upbringing influence others but ultimately it all comes down to our energy levels and whether they are in harmony or all blocked up.
If you don't have sufficient energy or the energy you do have is negative and feeding your illness rather than your soul, you need to seek help. Without energy you will shrivel up and die. Your energy is the more important software with your body being purely the hardware.
Your meridians i.e. for a number of reasons those lines of energy in your body connecting your organs can become blocked. Some of the problems may have been caused by your upbringing. If your parents didn't complement you or worse ignored you or put you down all the time, you will have a hard time building up a positive energy flow. I said hard but notice not impossible. If we want them badly enough all things in life are possible.
Your body can be affected by your negative thoughts. They will deprive your mind of endorphins and cause you to get all stiff and tense and weaken your immune system, leading to a higher probability of injury. Any minor ailments you may have can be dealt with by having positive thoughts which relax you and help your brain to release natural painkillers.
You need to know what you want from this life and you have to assume 100% responsibility for your life to date. Sure you may have come from a less than idyllic childhood but I am sure that there are thousands of other successful people who endured much worse. We can change our future a lot, but our past we can't change. Helen Keller who was deaf and dumb didn't let the disabilities of her body stop her from being extremely successful.
James Allen in his book As A Man Thinketh says "you are today where you thoughts have brought you. You will be tomorrow where you thoughts take you!"
You and only you have 100% control over those thoughts as you can control your energy and that in turn affects your conscious and subconscious mind. All thoughts and energies to sustain life are contained by the vessel that your body is.