A little advice please!

So I'm 16 and have been sexually active for about 2 years (I'm almost 17). I want to tell my parents so it will be easier to have safe sex instead of forgetting to use protection because we're sneaking and trying to hurry up (I know that isn't a good idea, I'm not stupid). But literally every time I sit down to talk to them about it, it's like they know I'm going to say something like that and they're like "you aren't having sex are you? Because if you are you'll be in big trouble" so I get scared of telling them. I just want to be safer because I'm going to be doing it anyways. I also want to start going to the gyno because I want to know what's happening with my body and I want to keep it healthy. 
Anyone have advice for me?