This is so tuff

I want to loose weight BAD I’m weighing between 400-414 lbs and my boyfriend is 189 he loves me with every curve and rolls. It’s just i would love to live long and enjoy our soon to be future with my already 6 year old daughter (not his). I often see women my size loose the weight. I’m young and I don’t want to be like this for the rest of my life. I’m tired of it. I’m beautiful with my curves but I’m ready to loose this weight. I want to be more active breath more when walking for long times have better more flexible sex with my partner , look GREAT IN MY FUTURE WEDDING 👗 DRESS! Does anyone have any ideas to start off without exercising in the first steps?!