Last time that I've cried

The last time that I’ve cried was last Thursday. Sometimes I feel very frustrated with my pronunciation and if the lack of words to express myself. I’ve been trying hard to enlarge my vocabulary and improve my pronunciation, but it seems not get better. I think my problem is that I speak Portuguese a lot, consequently I don’t practice my English. The most frustrate thing is when I want to express myself and I don’t find the right word, or the word with the same intensity. Also I believed that none word in another language can replace a word on my first language, especially when I’m talking about feelings.