Oh, I'm sorry to read that. Just the fact that you are questioning means that you are old enough to think about it because you ARE already thinking about it. You don't need to have sex to think about it. Quite the opposite, actually. It's good that you're trying to figure out what you want early. I never questioned my orientation or identity until I was in my 20s and I constantly feel I missed out on so many experiences I could've had if I had known earlier.
Do you think you could talk to your family about it? Explain to them that you thinking about these things doesn't mean you are already having sex or even that you necessarily will be gay or trans or whatever? It just means you already understand that there is a possibility you're not cis-het and you just want to be able to figure it out just in case. Because if it turns out you are different it is good to prepare for all the challenges that can bring. Especially school can be horrible to go through when you're different - in whatever way, doesn't even have to be sexual orientation or gender identity. And the more time you have to prepare for that, the more time you have to feel comfortable with yourself the better you will be able to power through and the more you will be able to ignore the hate that might come your way. And if it turns out after all the questioning you do find out you are both your assigned gender and heterosexual you can at least be sure you really are and aren't just following "classic gender roles" because everyone is.
I guess some of the younger members here will be better able to give you some more explicit advice on how to deal with parents as I never really did. Either way I'm wishing you all the best and that you'll be able to work it out. You are valid! <3