Hi Daniel,
Here's some help with your task. Best wishes, Guilherme.
Struggles to grow up (Better: Struggling to Grow/Improve)
I'm a chemical engineer from Brazil that need (who needs) to improve the english level (his level of English) to get a better position in my (his) career. I would like to meet a new friends to help me and (Tip: Start a new sentence here. ... to help me with English. I can teach him/her Portuguese in return) I can teach portuguese. Probably If I had studied english (English) when I was young I would have been in a good position in my career now because I lost (missed) many opportunities due (because or due to the fact that) I don't have a good english level. (level of English)