You're allergic to garlic, and disgusted by crucifixes. You sunburn easily. The amount of myoglobin in small, infrequent portions of meat is enough to sustain you as long as you maintain an otherwise healthy diet. You'll live an unnaturally long life: 125. Crossing the threshold of a sanctuary/cathedral/etc gives you a panic attack. Holy water grosses you out. You can't turn into a bat, but you get along well with them. You have a natural talent for aeronautics. People find you mildly charismatic. You can't enter a person's home without an invitation. There isn't an invisible force holding you back, you just find it unconscionable.

Edit: spelling