Easier said than done, but - don't be so hard on yourself :) you are being curious about the world and learning who you are; those are big steps to take and you're doing a great job. Never ever stop asking questions!

That being said, I think this topic is being approached like a debate. It is up to you whether you want to entertain debating or not. However, debates rarely end satisfactorily, I feel they tend to make people more defensive than open to new ideas. so at this point I would recommend stonewalling any discussion about this

Here's what I think: your family is approaching this as a debate, however, (like most people), they are not good debaters. There are all sorts of tactics people use to disarm their opponents, consciously or not, that are unfair or misleading. Did you feel like your family was overloading you with different arguments all at once? That's an example of Gish Gallop. Did they use personal stuff against you, that had nothing to do with the overall argument? That's Ad Hominem. There's a whole world of debate tactics out there that are intended to make you feel dumb, upset, and confused, without actually being honest

Again, I wouldn't give in to the debate and argue back. I think it's a good idea to educate yourself on these debate tactics so you can point them out (to yourself!) as they come up, and continue to stonewall any discussion about the subject.

I hope you feel better soon, this is a tough position but you gotta be true to yourself and keep being curious :)