Is this reasonable?

    
I'm only a few months off turning 17, although I still feel like I'm no older than 14. My parents treat me like I'm a child and are very protective.  I can't go anywhere without them having full details on where I'm going, who I'm going with, and so on.  It's regular protective parent stuff, really.
    
But recently I discovered they have a program set up on the family computer that is linked to my phone and school laptop, that tracks every website I visit!
They see EVERYTHING.
     
I don't know how much they use it, but I feel very uncomfortable.
    
Firstly, whenever I have questions relating to sex or my body, I google it.  I don't like the idea of my dad knowing I've looked up things like this.  Especially when some of them are about my own body (like: is it normal to have inverted nipples? are my labia too big? embarrassing things, y'know?)
     
Secondly.  Although it's embarrassing to admit, I really struggle to masturbate without watching porn.  I don't like that my parents can see that.
       
And thirdly, IT'S HOW MY PARENTS FOUND OUT I'M A LESBIAN.  A while ago they started asking me if I had a girlfriend, and I was really confused.  I realise now it's because I've watched lesbian porn and googled things relating to sexuality.
     
I really hate that they found this out about me through monitoring my internet history and not because i had the courage to tell them.
      
I asked my mum about the program and she told me that they have the right as my parents to be monitoring my phone and laptop.  I don't really know how to deal with the situation.