Hola Carina, yo enseño inglés en España. 

I have corrected your sentences to help you improve :)

Hi, I'm interested in learning English

I'am [I am or I'm] Carina and I'm from Mexico.
I'm an computer systems engineer in System Computer.
I want to learn and practice the English. Obviously I speak Spanish.

Hi, I'm interested in learning English.

I'am I am Carina ans and I'm from Mexico.

Obviously, I speak Spanish.

I'm an a Engineer in System Computer computer systems engineer.

I want to learn and parctice practice the English.