It would make more gramtical sense to say it like this. Using the word "would" implies a possibility in the future... I dont speak English as good as I should after all these years of studying.

Tahmine is correct. You are modifying "speak" which is a verb, so you need the adverb "well", not "good". "Good" is an adjective: I don't speak English as well as I should (be) after all these years of studying.

Yeah it's okay

as well as is true