honestly, i was so self-conscious about my body smell when i was your age. it's like, you're already dealing with so many changes, and then you start to notice that you smell different too. it can be really overwhelming.
i swear so many girls think this, but it feels like your body is just doing its own thing and you have no control over it. and the smell thing is especially weird because it's not like you can just ignore it or hide it all the time. but here's the thing: it's totally normal. your body is just starting to produce more sweat and oils, and that can make you smell differently.
okay, so basically, when you start going through puberty, your hormones change and that affects how your body works. one of the things that happens is that your sweat glands start to produce more sweat, and that can make you smell more. it's not because you're dirty or anything, it's just that your body is adjusting to all these new hormones.
one thing that might help is to start using deodorant or antiperspirant. it's not going to completely get rid of the smell, but it can help make you feel more confident and in control of your body. and hey, it's not like you're alone in this - every girl goes through it, and it's just a part of growing up. you've got this, and your body will figure it out eventually.