My parent's are trying to hook me up with a 19 an old boy but I'm already in a relationship what should I do?

Tell them you're not interested?

Well, yeah I guess my answer is just like the précédant ones. Tell your parents that toi can't be "hooked up" with this guy, since you're already in a relationship. Seriously, though, shouldn't your parents know that toi already have a boyfriend? Who is this guy, anyway?

It's probably something like your parents don't like your boyfriend, right?
Well, if that is right toi just need to tell them, that your staying with your boyfriend, toi like him a lot, and it doesn't matter who they try to set toi up with, and you'd really like them to be okay with it,
But do it in a civilized way, parents don't do well with anger ou toi yelling at them, so try to refrain from that, and try jouer la comédie plus grown up

just explain them the situation toi are in,they have to understand

mum and dad i have somthing to tell toi that I want to also have my opinion on this, that I like some one who i know really well and i... (just tell them what toi think)

Tell your parents! Explain to them that it isn't right for them to make toi be with someone when you're already with someone else. After all, this isn't the Medival times!

Let them know your happy with who your with and aren't interested in dating anyone else at the moment.