Buttons gross me out?

This is something I had since I was a kid. I remember asking my mum to cut off the buttons on my school uniform (it was a polo shirt) and have it stitched up. I started crying when I felt the spare button in the inside one day.
I thought I was over it because I had to wear buttoned up shirts throughout school. But I realised I tried to limit my contact and always wore a singlet so that there was something between me and the buttons.

Recently I bought a skirt online with buttons all the way down the middle. But when it arrived I hated trying it on, it actually made me feel sick with disgust and it is lying in another room now.

I know about the button phobia, but I'm not scared of buttons, I'm just repulsed by them for some reason. What could be the cause?
Buttons gross me out?
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