You said "where are you the chupacabras?".
Also, the chupacabras is originally from Puerto Rico, which is pretty much a state of the US(an unincorporated territory if you want the formal name).
I know there's a chilean one, but there must be others.
Don't worry about it, it's not like what you wrote was unintelligible.
Let's start with your first sentence, you changed tenses mid-sentence, you pretty much said "I didn't know there is so many spanish here" and I've seen like one spanish guy in the thread, remember Spain is in Europe, speaking spanish does not make you spanish.
Then, "fue" is used wrong, it's singular, and your subject was plural.
Even if you had said "fueron" it'd still be wrong, you should have said "eran".
In the spoiler, instead of "esta" it should have been "esté", and the "un" before "mitad" is wrong, "soy mitad español" is the correct way to say it.
Also it's "cuando" and not "quando", Q goes before U only when it's followed by an E or an I (que, quien, queso, quiero), and it should be "mala" and not "mal" in the final sentence.
I don't know if I got everything right, it's not like I'm a teacher, but I hope this can help you with your spanish.
