Why am i so Terrified of birds?

i have been scared of birds since i was at a very young age and now it has come to he point were i dont want to go out. i live by the seaside and every time i go out i see a bird i cower away or i will walk completely out of its path or some times i will just freeze. I have read the other questions like this and they say touch one or walk past one but i seriously cant! Its just pigeons and seagulls i cant stand the sight of one. I have had therapy for it and i didn't work PLEASE HELP ME !!