How can you be body positive?

I HATE myself, I hate mirrors, windows reflections of myself, looking down and seeing me etc, to the point that I got a job working nights so I don't have to go out during the day and risk being seen by anyone as I feel all eyes are on me constantly. ( I forced myself to even go to the induction day as I wasn't comfortable around people)

How can I love my body? Apparently telling yourself in the mirror something you love about your body helps but I've never tried it and I'd just feel silly... any tips? My anxiety is so bad when out in public and I just want to cry and hide from the world.