how do I stop my hair from breaking?

hello, im only 15 years old(girl), I started to let my hair grow out since last year(my parents used to make me shave it) I dont really know much about hair and the right product to use because I dont have hair. but now mi hair is growing,when I braid it 3-5 times it grow out a lot then all of a sudden it started breaking. it breaks soo bad that im scared of touching because hair might come out.( a few but still) what product should I use. by the way my hair is VERY SHORT (it used to be long enough for a braid by now not even). the only place theres a lot of hair is in the middle of my hair(its kind of like a mohawk thing. the sides are super short and the middle of my head is full of splitting hairs. its really wierd. also my hair is very nappy. so I relaxed it like every 2-4 months. becuase it makes my hair grows longer and very very very softer. also when I put a gel in my hair and then it drys it look soo wierd and livelive. I do not know what to do. me and my sister are having this problem. also im a muslim meaning I have to cover my hair at all times(but my parents allow me to go to school without covering my head) which is why im really worried about my hair. also I need advice about how to style my short hair to make it creative.