I promote body positivity, but for some of us, myself included, embracing your body doesn't come naturally, it can be a mammoth task for some, so instead catch yourself when you criticise your body. Try to talk to yourself as if you were talking to a loved friend . Find something you like about yourself to focus on! (For me it's my calf , we'll both of them, which is funny because I once hated them)
And if you do have goals for changing your body, don't over think it. Don't put too much pressure on yourself.
For example, if fat loss is your goal, you don't have to weigh yourself if it makes you feel like shit. For some people weighing is counterproductive. If you want to measure progress still, either do it via pictures and if that's too scary, take string measurements, no numbers, just take a piece of string, wrap it around your waist, cut it to circumference and stick it on the wall.
Most of all be kind to yourself x