I’m really insecure about my weight

I’ve been insecure about my body for quite a while. I’m 13 nearly 14, 5”2. I thought I was 57kg which seemed okay to me but the scales were wrong as I just checked and I’m 65kg, which is overweight in my eyes. I’ve always been insecure but this is the worst. How am I going to lose weight before school in 5 weeks? I’ve tried losing weight but my parents won’t let me do clubs or go out walking on my own and I get hungry a lot. I’m so tired of having to pick out clothes that hide my belly. I keep trying to convince myself that I look okay but crying every week over my body fat contradicts that. I hate how I look and I want to wear crop tops like other girls my age do, I want a nice side profile without chubby cheeks, I just want to not be so chubby. I constantly think that I look fat and I just want to lose weight so I don’t look bad but it’s just so hard ! I hate crying every night just because I can’t suck it up and lose weight