might have body dysmorpheria and don't know how to ask my parents for help

I can Identify with a lot of symptoms for body dysmorpheria ( I do not want to self diagnose here ) so I thought of maybe going to a therapist. The only problem is that I am 13 and I'm going to have to ask my parents for therapy. I'm scared of their reaction tho. My parents are good people. I don't think they understand how I feel tho. Whenever I bring up the topic of me not liking my body it feels like they kinda get mad. Maybe I'm just imagening things tho.They say that I have to stop with that and if I would stop eating that could end dangerously for me. I can't just stop tho. It's starting to become a serious issue. My body image and my facial features are following me everywhere. I can't stop thinking abt it. I'm going to do another thoroughly research on body dysmorpheria. Does anyone know how I can ask my parents for help?