How do i feel more condfident about my body?(and how do I know I'm losing weight??)?

I'm 16 and I'm a little more than a bit over weight for a girl that's only 5 foot even. I constantly bash my body and I think its a turn off to guys I like. My mom says I look like l'm losing weight but then I get on the scale and it says I've gained weight which is incredibly confusing. My friends(girls and guys) all say I have a nice shape and the guys I like are always really fit and still say I have a really nice body. But I still don't feel comfortable with my body and I want to know if there are ways I can change that. Also how do I know if I'm really losing weight??