It's probably not cancer. You are right to get it checked out, but the majority of breast lumps are not cancerous and the odds are that yours will be one of the majority that is completely harmless. This is especially true since you are only 14 and breast cancer is very rare at your age. 

Hope all goes well today and that the doctor will reassure you. 

I don't like touch either, by the way and a couple of doctors have noticed my reaction and asked if they hurt me or stuff like that. You can always tell them beforehand that you dislike being touched or that you are autistic. Most will be understanding.