Loss enough weight to be healthy

I have always been heavier than most of the kids my age when i was growing up and called fat by my own family. I came to a point in my life when i excepted it and just let my self go. I am now 265 lb and when i walk i just feel heavy, and short of breath. I don’t want to loss weight becasue i think i will be prettier or anything I just want to loss enough to be healthy.