My perspective on this is that you should first have this checked out medically. If there's nothing going on that can be addressed medically, then therapy would be the next step in order to try to figure out what is causing you to feel this way. It may be that what you'll need is to participate of some progressive desensitization. This would involve starting out with the slightest touch you can tolerate & gradually working up toward more involved touches. This is something a therapist could help you with.