Question

50 pkt Czy ten tekst jest poprawnie gramatycznie? Proszę o sprawdzenie.

I think that is normal. You're a teenager and you want to be the center of attention.
I think you should talk about it with your parents. You should start to learn. If you can't deal with the science to ask the teacher for help. Maybe you ask your sister how to cope in school. You shouldn't give up.
I hope that you helped.