I have a phobia of knocking on doors

I will not knock or ring a door bell . It freaks me the hell out . I Call when i am there and tell them i have arrived i wont knock or ring a bell . I even call my grams and have her open the door . I also wont answer a door ... I feel a fear of panic . If you are not someone i no i wont answer the door at all . I dont no why i look into it they say a fear of rejection.... Or a person or door bell ring that caused me fear . Nope not that but i would hate to have some charge at me or something freaks me out I refuse to go to the bathroom when i am at people places i make my husband take me to the nearest store . <------ I also wipe the toilet seat down . I have a lot of issues fear of cars , driving . I will go i more details on that later on but like i said i am fucked up ....