I’m from Vietnam. I’ve been in the UK for 10 years now. When I met my English husband 13 years ago at 19 I knew 0 English. We communicated using machine translation. So that’s when I started learning English. Fast forward to present day after immersion, living in an English speaking country, formal study, etc. and I’d say my writing and listening (understanding) are good, but my speaking and reading are still bad. I kind of gave up on trying to become fluent at this point.
Tbf, you’re not wrong about the inconsistency of English, it’s because we stole words, phrases, entire dialects from so many sources. And sometimes we kept the original pronunciation, other times we rudely imposed our phonetic expectations of the time and place when we stole them. Also the “correct” pronunciation for many words is different in different English-speaking countries.
On the plus side for you, that means most people are pretty lenient about what we consider “fluent,” and make allowances for accent. Unless they’re a racist asshole in the first place. When you mispronounce a word because you’re following phonetic rules but that word breaks them, most of us can recognize that version because we did the same thing when learning to read.