I am aware of that. I am a pescetarian but on this site I have vegetarian badge.
Just imagine you are in a family where the rest of the people are full-on meat eaters and it has taken you ages of begging to get them to let you be pescetarian. Thats what it is like at my house. I've tried to stop eating seafood but my Mum won't let me. I am also giving up dairy altogether, and soonish I will be getting backyard chooks so I don't have to buy eggs.
I just didn't have the courage to call myself a meat-eater. Please don't judge me. I am only 11!

Hey Lala!
I was in the exact same position you're in a few years ago, when I first broke the idea of being vegetarian to my parents.
It took me a year to finally convince my parents I could be a healthy happy vegetarian, although they still weren't keen on the idea.

I think our point here is, it's rather annoying when people say they are vegetarian, but then exempt themselves when it comes to eating animals like fish, and when telling others, it can get confusing and rather fustrating when you have people assuming you can eat fish etc if you're vegetarian, because that's what other people have said you can.
The correct term is pescetarian, and there is no shame in using that term!
Some of us forget how hard it is to change a lifestyle in a family environment that doesn't agree with it, but don't worry, most of us haven't forgotten.
Patience is key, and knowledge. There is plenty of information out there on the environmental disbenefits from the consumption of seafood products, have you tried that angle with your parents?
Protein was the main issue when it came to convincing mine I didn't need seafood, things like beans & legumes are packed full of it, you need to show your parents you're willing to eat meals full of this kind of stuff, in order to prove to them you are going to be healthy!
Also, the final straw broke for my parents when they said unless I was willing to cook my own meals, they weren't going to cater for my "phases". I said I would, and now, about 2 years later I still am.
You just need to prove you're serious about this, and they aren't going to win any brownie points if they keep trying to force you otherwise.
alot of parents think that when it comes to things like this you will "give up", that is what you need to get past, them thinking this is going to go away if they ignore it for long enough.
Good luck!