Who I am and what I'm looking for:

Hi there! I'm from Spain, where I've lived since I was born. I'm 21 years old. I'm studying journalism and I'm hopefully about to finish my degree, I hope so. I'm here to improve my English as a second language. Still, I will also be able to help other people in order to improve their Spanish.

Very nice! Just a couple of small things - for example in English the names of languages tend to be capitalized.

Who I am and what I'm looking for

Hi there! I'm from Spain, where I've lived since I was born. I'm 21 years old. I'm studying journalism and I'm about to finish my degree, or at least I hope to so. I'm here to improve my English as a second language. Still In addition, I will be able to help other people in order to improve their Spanish.

Nicely written.  Just a few minor changes.  "Still" = aún o todavía but I think you meant además.