Claustrophobic - I am not too fond of large crowds of people, hate having restricted mobility. Wearing anything tight bothers me as well because of the restricted mobility aspect of my fear.
Also afraid of rejection - this is a common one, and may not even be passable as a fear, but I more often than not have difficulties talking to new people out of not wanting to make a fool of myself unless they initiate the interaction. Don't have this difficulty online, leading me to believe that this may just be a result of social anxiety/awkwardness.