I'm obese technically ?

I weigh 185 lbs and I'm five foot one. I just want to lose weight and feel good about myself again. I'm tired of feeling like my fiancé doesn't want sex because I'm too heavy or feeling like if I sit on something it will break. I want my DF to lift me up again and I'm not cringing because I think I'll break his back.. I cry about this every day so something needs to change! I'm going for it-- I will weigh 106 lbs again.