What should i do? Is this bullying?

Im just about to explode the thing is that i have pretyy bad social anxiety (phobia to people) and i cant even go to waltmart without feeling ok without myself i know this is pathetic but i cant help it is hereditary besdisws im going to therapy Now what really upsets me is that im the younger of my 4 siblings thwy two of them tendr� to say that im a ****** and that theres no such thing as social anxiety that im just a oh did i mention that thwy ar� 25 and 20 and the two of them have tried to beat me up but my other brothers who is27 is the one who has helped me i kinda see this normal now I know there are fights between brothers all the time but is this bullying?