They cant respect my privacy

So i suffer pretty bad with anxiety and depression and would love some advice as i dont have anyone i can speak to. Mine and my families relationship isnt the best. Im an introvert so tend to distance myself however my sister is a “busy body” and always tries to get in my business but im a really private person. She will come to my house and slyly look around. She then reports back to my mum and my mum will hint to me. (That is not me being paranoid as i can be, this is genuinly what they do). My brother is also really private and they respect that. It makes my anxiety go through the roof everytime im around them. Every time i say something about it they tell me not to be so immature and pathetic. I just dont want them knowing my business because they tell EVERYONE even though its not their place to.

I had an abortion a few years ago and it really effected me badly. I still to this day cry because i feel so guilty. At the time i hadnt told anyone apart from my mum. My mum then took it upon herself to tell my sister and my cousins that i barely talk to. I still havent said anything because iv never felt so betrayed it was not her business to tell.

I just want to know if im being immature and pathetic like they said.