You may be asexual. Possibly you are graysexual.
Since you react rather uncomfortably to any physical contact from another, there might be something deeper, possibly related to a trauma of some kind which you buried deep in your psyche.
Then again, maybe your libido has not yet awakened. (you did not indicate your age)
As for being asexual, in many cases with people, sexuality changes over time. As long as you are a decent person and function well with others, don't freak out over this. Let life take you along, enjoy the journey and learn to lioe, accept and even love you, love who you are.