Introducing myself (or My Introduction)

Hi, my name is Haida and I'm from Brazil. I'm 20 and I'm currently studying to be accepted into the best public local college. It took me a while to decide what I really wanted to do with the rest of my life, but fortunately I feel pretty sure now that I want to study Graphic Design and/or get a degree in Portuguese/English Languages and Literatures, both interest/ stimulate me. In my country - and I believe in most other developing countries - people need to take an exams to enroll in their desired the public colleges that they want to go to. So the whole year of exams must be very dedicated to your studies if you want to be selected among a hundred people. 

I have been learning English by myself since I've noticied that it's pretty simple. I'm just starting but sometimes I've already think it's easier to express than my own native language Portuguese. I studied some English at school of course, but It was more like a foundation for learning. My English is pretty based on the online games, musics and films that I've watched. So I think it's time to improve more deeply my knowledge of this language. (:

Good job! Here are some corrections. I hope you find them helpful.

Nick