Help my hair

Anybody have tips on how to take care of my hair. My mom is porterican and my dad is mexican

My hair is thin and frizzy like a porterican But i got a mix of my dads straight and silky hair and my moms curly frizzy (REALLY frizzy) hair and it sucks because my hair isnt as thick as my moms, so i only have this much hair all together

Plz help all my life people have made fun of me and say i dont brush my hair, but i do . Every morning i cry because no matter what i do my hair looks bad 😢 even if i get it to kinda look okay right when i get to school it looks bad again