I can clearly see what you meant by your question. the most major problem of your i think its tense. You confused with tense, you cannot blend present with present continuous. Like in your question its not 'icant speaking fastly' it will be, 'i cant speak faster'. There is not word called "fastly".
I will suggest read lots of lots of English novels watch English shows, movies and moreover read newspapers everyday. Talk to peoples who knows better english, i really a bad speaker of English at first, but eventually after talking, lots of practice and reading it became in my control and now on my way to a novel.
Understand one thing English is not a qualification, its just a language which we use universally. So dont be afraid give a shot.