My goodness! Why on earth have you kept this to yourself? You have a legitimate problem and you are letting your parents and siblings believe that you are a “bad” kid. Huh?
Some people have what are called “sensory processing disorders.” This means that they react either too little or too much outside the range of usual to sensory stimulation. For some people, specific fabrics or how a food feels in the mouth can be intolerable. Other kids don’t feel things enough and put themselves in danger. For example: When a kid doesn’t feel heat and gets too close to the stove, he can get badly burned. Any of the five senses (vision, smell, hearing, touch, taste) can be involved. Some people suffer (and, yes, it is genuine suffering) from more than one sensory disturbance.
I can’t give you a diagnosis on the basis of a letter. What I can do is let you know that your experience is real and that you need help learning how to deal with it. Whatever you’ve been doing to manage clearly isn’t working.
Please show your letter and this response to your parents. You need an evaluation from a mental health counselor who specializes in sensory processing disorders. Once you’ve had a thorough assessment, the counselor will make recommendations to you and your folks about ways to help you.
I wish you well.