Is it normal to not be close to your family ?

Okay i have an older brother, younger sister, Mum and step dad we are not a very similar family everyone is different and has different interest but my siblings a closer to each other than i am to them and are also closer to our parents than i am to them.
From what i can remember i have always been the outsider in the family i used to be afraid of my mum growing up as a kid, not because she was horrible to me its just because shes a strict stereotypical African mum.

I never felt comfortable talking to her or asking her advise through out my teens, i'm 21 years old and still i don't feel comfortable talking her, don't get me wrong i can speaking to her about certain stuff e.g education, jobs but just a general conversation does not happen. When it comes to my older brother he has never been at home his always be away at boarding school or at uni so our conversations are really short, sometimes we joke around here and there but rarely does it go into deep conversations. My step dad and i yeah we joke around sometimes we don't actually speak to each half the time its usual just say morning or hi to each other and then just complete silence.

When growing i never really had anyone to ask advise from so iv grown up kinda depending on myself to a point of where when my mum tries to help i feel uncomfortable and i usually say "i'm fine" i do whatever it is myself. All my friends usually have someone in there family their close too but not me, i'm actually closer to my friends than my family. My brother has now realized how i'm not close to my mum but just doesn't understand why i don't comfortable to speaking to her.

This does sound sad but its what i'm used to so i don't feel neglected or sad, so i want to know if its normal to be like this ?